Only sites with a presence in the EU are paying attention. The LA Times is a counter-example of a site that hasn't bothered with GDPR because they didn't feel EU users were worthwhile keeping.
However, collecting data on the 0.5 billion people in the EU evidently seemed worthwhile for most sites.
And similar arguments could be made for why American companies would play nice to the EU.
If your company was unable to comply with GDPR, many wouldn't want business with your company anyway, especially other companies who are trying to comply with it.
Except for military force and incarcerations per capita, the US is lagging behind in almost every statistic compared to China or the EU.
I get that everyone is super excited about GDPR, but sorry to say most websites can safely ignore it.