For the non-tablet Kindle, I'm not sure if the differentiation between tracking and ads makes a lot of sense. You (well, I at least) already use Amazon to buy

For the non-tablet Kindle, I'm not sure if the differentiation between tracking and ads makes a lot of sense. You (well, I at least) already use Amazon to buy the books that are on my Kindle. I guess they could track how fast I read them. But that seems trivial compared to already knowing what I'm reading.