They're perfectly legal if they don't process any PII. If a US company serves static content there's no need to fear the EU; they'll just have to disable illegal external integrations like Google Analytics/Fonts/etc.
A company doing business with other companies might find themselves in a position where they can comply perfectly. Not every company needs to collect PII, though these days every company likes to pretend they do.
A company doing business with other companies might find themselves in a position where they can comply perfectly. Not every company needs to collect PII, though these days every company likes to pretend they do.