Chills

OK, but what does that have to do with the Affinity products that Canva now owns? Can you not still use the Affinity apps you already own for your projects & if that involves printing them can you not still choose to do that with the businesses that provide supply chains you approve of?
What is this guess based on? As for there being an option for it if your guess is right, if it is just an offer for such things, why can't you simply ignore it?

But does Canva itself own the business that prints the teeshirts, or does it simply facilitate the ordering & printing with some other business(es) that do that?

I suspect that Canva being global subcontract this out to local places in each country who supply and print the garments.  In which case it is down to the laws in that country as to the supply chain.    

I have to say that there is zero chance of that happening.
The European Union and British competition regulators effectively torpedoed the Figma-Adobe merger because it was a profoundly anti-competitive move that would have harmed commercial competition and consumer choice.
Therefore, any potential Canva/Serif Europe merger with Adobe Corporation is just not going to happen, ever. Even the slothful US Department of Justice would baulk at a monstrously anti-competitive move like that.
tl;dr Never Going to Happen.

I don't understand what Canva supply chain you are talking about. All its products are virtual so what does this chain consist of?

In other words, you have made statements you can't back up about a mythical union. 
Now I know how to regard the accuracy of your other posts  

This is a serious accusation. Is there any evidence that Canva is engaging in such practices?

I don't have any adverts in any of my Windows 7, 10 or 11.

It's an aligation often slung around by Linux Devotees without any evidence bar the odd outlier.   When consumers buy a PC from one or two well known chains that sell everything from TVs to fridges to PC's, they put on demo and evaluation software that says use/buy me.    Some users do and most don't they just uninstall it.  You do't get it from most suppliers, and never AFAIK for business users.

OTOH with Linux's you have no idea what you are getting. Anyone could have built it and added anything into the system or even modified the source code. No one ever checks  (OK a very few do and I have seen the results of that.)
 

No, I didn’t miss it, I just felt it wasn’t essential to the point I was trying to make.

https://affinity.help/publisher/en-US.lproj/index.html?page=pages/Publishing/publishPDFFiles.html?title=Publishing PDF files

Off the top of my head I think that the Print is RGB and the Press Ready is CMYK. I am frequently wrong though.

If password3.pdf is opened in LibreOffice Draw there is no warning whatsoever so "I didn't know" would be true and honest
It's trivial to remove the password from such a file, I think Affinity's approach to passwords could be a little more robust
The attached file is password protected by Draw, Chrome won't allow copying or printing, Publisher V1 allows copying if the file is opened without entering the password. The only software I would depend on for password protection is Acrobat but I no longer have it so cannot test it
password3fromdraw.pdf

Use these settings during Export from an Affinity application:

(with a password specified, of course, in the Permissions password field)
That will result in a PDF with these settings, that anyone can Open in Acrobat Reader without a password (but will not be able to Open or Place in Affinity applications without one.)

Here's a sample, with password = password
password3.pdf

Of course, that has always been the way around PW protected PDFs However I only want to do it to stop the casual disassembly and to show if anyone has done it they have had to intentionally do it knowing the PDF was protected.  "I didn't know" won't be an excuse.

I don’t know whether it’s possible to permit printing of a password-protected PDF file, but if it is then I don’t see how you could prevent printing to a PDF printer driver. That would, of course, result in the creation of a PDF file that isn’t password-protected, which rather defeats the object of the exercise.

Good Luck with that Ubuntu changes version more often than Windows and support ends for each version far faster than for windows. If Ubunto is still there at that time....
The other thing is many of the components in Ubuntu come from 3rd parties.  Your problems aren't Windows Security patches but Linux security. 

Being semiretired, I cannot afford to go back to Adobe, nor do I want the constant drip of my funds.  I expect to stay with Affinity as long as they do not go to a subscription mode; if they do, meaning that I would likely have to save up for Quark, I can do that—but will use the last version before subscription in the meantime, as I did for mreo than 5 years with InDesign.  (I still have an old computer with InDesign CS4 installed for when/if I want to update an old file.)

@Ash I've heard on a grapevine (an Affinity insider) that 'Affinity' and 'Canva' are working on a VERY special PR promotional video to reassure current Affinity customers, that everything will be fine and that Affinity really values us beyond words, making sure that Canva will value us in the same way. The VERY special PR video is almost complete, in the background Ash has been tirelessly working away in the studio with 90's dance sensation 'Double You' to use the below song with the promotional video the to win us back
 
 

FWIW, reading about the exchange of massive amounts of other people's money can feel so inconsequential  😂 Currently re-watching Silicon Valley in the same vein...

Much as Serif did with Affinity 1.9, then 1.10. They never got to 1.11, but they could have if they hadn't decided to switch to version 2.0 instead.

There is a Worldwide standard, but Creatives by their nature don't follow it... 🙂
and in Marketing,  "new" is an old word.
Seriously, there probably is an accepted standard for version control for software BUT if you note V1.5  is build 27332.23.4.5 so the version control system for SW is not the same as the marketing release numbers.  Look at OSX for example after 10.9 (the X in OSX being "10" )  it went to 10.10 as opposed to 10.1 and then to 10.11

For Adobe CS the difference between CS5.0 and CS5.5 was far greater than the small incremental changes between CS5.5 and CS6.0
So version numbers mean nothing other than it is the next release.  The Build numbers (where you can see them) show a bit more.   However, these numbers are completely orthogonal  to any other product.  Even from the same developers, let alone another company.

Those numbers don't mean anything.
Or is there a Worldwide Versioning Standard Committee® whitepaper which every developer must painstakingly follow otherwise they will be removed from their License To Develop™…? 

Something tells me you've become all too accustomed to having your suggestions dismissed. (Playfully joking here, not at all meant to be snark)

I'm not against that suggestion, but I think no matter what, something has to change if they ever intend to go after the "big dogs". And that may very well not be their intention if the goal is to target something like Canva's current demographic, which is quite large... and legitimately, there's nothing wrong with this as that is a market that is demanding to be served. It would just be disappointing to a number of people who were hoping to get further away from Adobe's workflow beyond the typical technical, economic, professional reasons, etc. (i.e. creative).. people who were already happy with Adobe will just continue using Adobe.
Theoretically also, Canva can be intending to "buy" the technology to put into the product rather than building it themselves as they seem to be gathering technologies as capital as their habit. Serif's software can be a wrapper for whatever future business aspirations they have down the line for a professional suite... so many possibilities. It doesn't fix preexisting bugs though. Some can say very little will change as far as how Affinity is being developed, but I don't see how that happens the more that I think about it... surely Affinity is worth the $$$ it is because of the possibilities of building atop its foundation. Whether that is good or bad news is subjective to the individual customer.

Items for our consideration... consider these in relation to the Serif acquisition which was in late March:

(Apr 5th) Canva millionaires made as $US1.6b share sale completes
https://www.afr.com/technology/canva-millionaires-made-share-sale-to-hit-3-6bn-first-1-6bn-done-20240405-p5fhmm

Why the $2.43 billion Canva share sale is an epic moment for Australian tech
https://www.startupdaily.net/topic/business/why-the-2-43-billion-canva-share-sale-is-an-epic-moment-for-australian-tech/

(Apr 18th) Pixels and Pictures: Canva challenges Adobe with Affinity acquisition (33%)
https://kstatecollegian.com/2024/04/18/pixels-and-pictures-canva-challenges-adobe-with-affinity-acquisition/


 
Edit: Post below is older but keeping in because the quote is interesting to me. Unfortunately, I can't change text color of date because I am on mobile atm

Edit2: Hail, desktop.
(Apr 26 2022) Investor drastically slashes value of its Canva shares price
https://www.news.com.au/finance/business/other-industries/canva-takes-hit-to-valuation-after-investor-wipes-33-per-cent-off-share-price/news-story/db5c38dde744b4576d52dd11b0e6ffa9

I'm sure there are other articles floating out there that can adjust the picture a bit, but this was all I could find...

Good Luck with that Ubuntu changes version more often than Windows and support ends for each version far faster than for windows. If Ubunto is still there at that time....
The other thing is many of the components in Ubuntu come from 3rd parties.  Your problems aren't Windows Security patches but Linux security.