Don't forget facebook, twitter and any other ad-driven 'user content platform'.

The way it works:

Someone (usually skilled/connected enough to do it anonymous) uploads tis shit

Posts the link on shady ass closed communities (usually you have to pay for acces, crypto is also a bless for these ******)

It gets views and (even if ads are turned off in yt) this 'view' time is their biggest selling point to advertisement companies. If there are ads shown, it's big money for these companies since it's regarded by their linked viewers as a free porn streaming service with some ads.

Now these payed communities usually have like a manual.