I expect Canada is not beyond the reach of US copyright law, in practice.
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.
Apparently not, as Pornhub is Canadian.