I'm a bit surprised at those posters who seem to have an all-or-nothing view of privacy. I can't protect my privacy perfectly, and there's a lot more I could do but am not willing to because of the hassle, but that's no reason to give up
all attempts to reduce the amount of info I give away, especially when doing so costs me very little in lost convenience. (Just like I'm not willing to eat
only healthy food, but enjoying cake and ice cream doesn't mean it's pointless for me to also eat wholemeal bread and lots of vegetables.)
So, for instance: I'm not willing to delete my Facebook account, but I've installed
a browser add-on which reduces the amount of info I give to Zuckerberg. I'm not willing to delete my Amazon account, but I buy my books elsewhere if I can. I'm not willing to stop using my Gmail account (although I'm considering actually going through the effort of doing so), but I've turned off all the tracking I can turn off in my Google account, and use a
privacy friendly search engine.
Thanks to Difflugia for
answering my question about which features I'd get with registering an ereader, by the way