I’ve been looking into getting an e-reader, but I’m scared to get one from Amazon due to things like this. Are there any decent hackable and/or trustworthy ones out there?
There are Android e-Readers, like Boox, but that does not imply it is easy to do fun stuff. Seems pretty locked down. I have a PocketBook myself, no complaints there and you can install software (at least I can on the one I have but it is a few years old now) and thus never had the need to hack the thing.
Kobo's devices let you bypass the account signup via a single option in a config file. Whether you do so or not it's easy to install koreader and start writing plugins for it. You can also hack on the linux OS they use