I canceled ongoing donations to several projects based in the US and stated that my reasons for doing so was US policy against my country. It doesn’t matter if the dev or project lead supports those policies or not, I refuse to contribute to the US economy if I can at all help it.

Can this handle plugins? I use a modded DeDRM on my Kindle Unlimited books, and so require plugin support.

That’s stupid. Nothing stops you from just installing regular Ubuntu if you love snaps so much.

There’s Librera FD, on F-droid. It’s the open source version of Librera on the google play store. I believe it strips out the google api/cloud stuff, but its db /reading status/etc are all easily synced via Nextcloud (which is what I do). The only real negative I’ve found with it is that it’s search for text in books is slow compared to more popular reading apps like Moon+ Reader.