Well, the mentioned credit card checks would be applicable regardless of your residency/citizenship, so if you're visiting France and try to browse Pornhub, you'd be required to provide CC details for the verification, is my understanding at least

Or you have a ID issued by France, and you'll use that.

Besides, heavily depends on how the verification services implement their checks. Whenever I (Spanish resident, Swedish citizen) end up having to do verification checks for some EU/Spanish service, they usually have more or less every type of ID I could have been using available.