Vinyl? No, not at all. Pressing the platter is already the lossy part, playing has less dynamic range. Some just like the mechanical part and scratching noises better.
Onyx are Androids. But you should debloat/silence them a bit before, same as Kindle/any vendor Droid. And batterx life is not that great.
PocketBook have a more limited app selection (though there's a Nextcloud app) and their SDK is old. But they're running pure Linux and are excellent in openness and battery life.
I took a Onyx instead of a Kobo, because Kobo are locked down Androids. Though they are quite open in supported formats too.
Hmm, now if they were forced to export your data, if you don't agree.
Btw, there should really be some sort of legal "usage license" you can use with other providers, since you don't own the game you buy. If not, it's just a scam.
Wasn't there an rocket concept like that from the 70's, using the freed electrons for containement or something? I saw it once on Wikipedia and then never found it again.
Woah. Weren't they, what, 2$ a piece before CD?