I know that it allows you to put any books you like on it if you jailbreak it, but I'm not really sure where else I can buy ebooks and the money goes to the author.
Also I actually quite like the default reading experience (I have a paperwhite) and jailbroken stuff often has less polish.
The device will still call home though; which sucks in terms of privacy and also allows amazon to potentially delete your books remotely.
yeah i just never connect my kindle to the internet lol.