Humans are humans, regardless of what country they live in. If I have a larger dataset than you, and I can do more things with it, then I can predict human behavior in a given situation better than you can. That gives me a competitive advantage over you. I may be able to then go compete with you in the EU without ever having to violate the ML provisions of GDPR, because I know what humans - whether in the EU or US - will do.

Granted, there are some country-specific behaviors that this will not apply to, but then nobody will be finding out what those are in the EU because it's now illegal to do there.