Peertube

Peertube is run by volunteers who pay with their own money and time for the convenience of others to use it for free. People generally run it to give people social media options outside centralized corporate control.

Why would someone put themselves in legal jeopardy and host pirated content, knowing their arrest is imminent? You can't hide your site easily.

Porn would be overwhelmingly expensive to run because of the sheer amount of traffic, storage, and numbers of people. It would have legal exposure too and require huge moderation problems, with no return for the effort.

There's some but they don't federate for that reason. You just have to find it.

Also as others have said, people just want to host their own videos mostly. Its like old YouTube before Google bought it.

Besides what Jerry and CameronDev said, a conjecture on the piracy part, but also could be that a majority of people running Peertube instances and even the people publishing contents for Peertube don't subscribe to the idea of piracy.

You'll eventually get legally bitchslapped. Hard.