> (US sites comply by region blocking GDPR covered users).
The only thing they comply with is their own paranoia. The GDPR doesn't even apply to US companies if they don't specifically target EU users.
I wouldn't be surprised if many sites were only violating the GDPR because they show those "cookie notices" which completely miss the point and don't help with compliance but could be considered catering to EU users.
People regularly complain about the GDPR here (US sites comply by region blocking GDPR covered users).