That’s probably the worst usability problem with the current web, it used to be popups, now it’s constant in your face consent forms. Consent forms are really just legally enforced popups.
Probably US users don’t know how bad it is because the US sites only add them to requests originating in the EU.
Most of these sites needed or wanted them implemented on the cheap. Restricting it to EU customers would require extra work...
It makes no sense. If there isn’t a legal requirement, why would they risk impacting their ability to make money?