Books

I recently got a boox go color 7 because I dont have space to buy physical books. the only platforms I can find that have a decent selection are ones like kindle where you dont get the book, only the ability to read it through their app. i want to use the built in reader on my device and I dont want to be able to get rugpulled by Amazon or lose access to my books when a smaller company goes under.

I'm fairly comfortable on the high seas but whenever a book is available without DRM I'd prefer to buy it so I can support the author. do you guys know any platforms with a good selection of drm-free ebooks? Manga too, but I'm pretty sure the only place you can get it in the us anymore is viz through an app. also as a side question, what format is best?