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I'll say this coming from only working in the mainstream for a bunch of years now. Take a look at YouTube, Google, Facebook and look at the ads. The data that drives this spans the entire spectrum of available knowledge and they can still do a killer job of pushing ads and related content that actually engage users.
You can monitor porn surfers with a teeny tiny sliver of the infrastructure that goes into that. Even if a user only browses the front page, with such a narrow focus it's nothing to build a detailed profile of his sexual appetite based on which videos he watches, what videos he previews, etc. Even in the good old days, you didn't make money selling teen videos. You built sites to filter people into specialty content tailored to them enough to buy. That's totally lost on tube sites, but it doesn't have to be. You can easily provide regular college coed anal videos for 80% of surfers and then hit the other guys repeatedly with stuff that seems like it was made just for them.
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