On paper PornHub seems headquartered in Cyprus, and parent company MindGeek in Luxembourg. Tax reasons both probably. But it doesn't matter because MindGeek also owns Brazzers, Reality Kings, and a bunch of other porn studios, and they operate out of the US ("porn valley") a lot. Simply ignoring US law can get them in to a lot of trouble. Even a EU-based outfit is relatively safe in comparison, never mind something located in Russia or whatnot.