Don't throw away your Kindle, Jailbreak it and take back ownership. Make your Kindle even better with KoReader and other apps. If you wanna see whats possible i recomment this Yt video. If you wanna get started here are all instructions: https://kindlemodding.org/ Don't let it scare you it seems complicated but its just a lot of (easy) steps. So definitely possible in <2h.
Yeah, I am wondering the same, I don't have a Kindle, my gf has one though, and it is perpetually in airplane mode... Because why would we need the wifi on for this thing all the time?