Just wanted to add on behalf of this thread https://forum.affinity.serif.com/index.php?/topic/4747-are-there-any-plans-to-support-linux/
Win and OSX are going freeware. Ironically Linux distros may go for pay models. Why do i think that will happen? Well i can't explain because my English is bad but it has to do with something called personal data mining.
On behalf of this software. I would never back software company that want ridiculous $500.000 for frontend, it's wasted effort. Propriatery software is not ethical. If you run propriatery software on GNU/Linux then you are in atleast same security danger as Mac user.
For end i want to remind everyone asking for linux port that CRM staff wrote this incredulous price of $500.000 with other ignorrant jokes.