Let's take a reality pill here please.
Online earnings/profits are falling.
The big guys don't make enough to start these type of lawsuits.
Some even have told me pirated content is like an advert for their site.
some people even believe piracy does not represent a lost sale.
Going after pirates in court is a very expensive business.
The likelihood of winning is slim.
There are hundreds of pirates to chase.
It's far cheaper to send out DMCAs even if they have little effect.
Going after the uploaders might be a better bet, but still more expensive than the return.
Most porn is cloned and stereotyped scenes. If one producer removes hot content is still leaves 1,000 other similar scenes out there for free.
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The answer to piracy lies in having something they can't compete with, appeals to the porn customer more and he's willing to buy.