[fabricalado]

All valid points that you're all offering, and yet they're more reasons not to register a device, imo! If it's possible to sideload books on a Kindle, there's less need to register mine.

Maybe the question is, or is turning into, why do some people trust Amazon/Rakuten/etc with their data and others don't? Here I think it's totally possible to hold contradictory positions: you can buy a Kindle, Kobo etc, and still not trust these companies 100%.

(I'm in Canada, but we have Overdrive here! And yes, that would be a reason for me to register, since I think it's not possible to use it otherwise.)