Well, most of these lawsuits have been unsuccessful barring the one that Alison refers to where a possibly beneficial settlement was reached.

As long as adult industry players continue to pay to place ads or allow illegal tube sites to be affiliates then this “problem” can only continue. There is a financial interest in offering this free and often times copyright infringing content ... This should be obvious ...

As for the “locker” concept — I would ask how incidental is their paid storage of copyright infringing content. Generally speaking, they would have safe harbor as someone like youtube would have — DMCA and mitigation. However, if their activities can be proven in conspiracy with illegal tube sites that would change things.