All good points (although I'd probably be concerned if I saw anyone taking even one pic of my house
). I doubt any of my reading activity is able to be tracked though because I simply keep wifi off always and only sideload my books through Calibre once they've been freed of DRM. I only manually update firmware as well, so wifi is really never ever on.
So even though yes, I used a real email address to register, there's no info attached to it and they can't spy on my reading without wifi turned on. Amazon knows what books I do buy of course, but nothing else about what I do with them afterwards since I never read on the Kindle.