Yes, please release a Windows (and Linux) version of Affinity Photo. For Max users, there are now a lot of great graphic programs like Affinity Photo, Photoshop, Pixelmator and Sketch.
Windows users have to use Photoshop. There is no real alternative. (In my eyes Gimp cannot be used for professional work)
And Linux user ... Even if Linux user want to buy professional graphic software, they are not able to.
I would buy an Affinity Photo Windows (or Linux) Version for some hundret euros. The main thing is that I do not rely on Adobe products.