Forget all the stuff out there that says the GDPR protects EU citizens. This is a question of jurisdiction and enforcement. Say I run a blog under a business registered in the US funded by advertisers in the US. A EU citizen that comments on posts issues a GDPR request that I ignore. Their government fines me. I tell them to get bent, I am out of their jurisdiction. What can they do at that point?
Apparently it is being implemented via executive order. It seems like enforcement could be struck down in the courts. For those that aren’t familiar with how the US works, an EO is just the president telling federal employees to do something. Biden could issue an EO telling the FBI to arrest me for calling him a poopy head, but I would never be indicted for it. I am not seeing it on the state department list of US treaties either. So with no real treaty, the question still stands of what can the EU really do to a US entity that refuses to comply?