You are aware that it's pretty much only American companies that are bitching about GPDR, right?

EU laws already cover EU companies as a matter of domicile. GPDR only applies the rules of service delivery already present in EU. EU service delivery rules say that a service is delivery point is considered the place where the service consumer is, not where the provider is domiciled.

We don't know how enforcement will look just yet, but at the end of the day, court-related decisions are made by humans and its hard to argue that Facebook version made in France will be less or equally looked upon in European court than Facebook made in Silicon Valley, U.S.A.