"IF" Identity Ecosystem is further developed and then deployed, will it effect what you download online?
You have already been tracked by merchants and the government for years. Now don't get paranoid. They, for the greatest part, do it for sound reasons. They aren’t watching
YOU, in particular. But more like "How many people buy this or that product". With the governments it's more like "How many people smoke, and how high can we tax them without them quitting". (You think that they raise taxes on cigarettes to discourage people from smoking?

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Will it affect your ebook purchases? Would you revert to paper books?
Personally, I get all of my books from a man in a trench coat on dark moonless nights.