Probably amazon They can also see the things that you highlight, the things that you reread. This could be used to profile the reader and personalize ads not

Probably amazon They can also see the things that you highlight, the things that you reread. This could be used to profile the reader and personalize ads not only this, but being forced to buy an ebook through their portal, they'll know everything you're reading. Whereas you could read pdfs anonymously if you wanted