Re: GDPR down the throat
"More likely that they don't get enough revenue from EU people to make it worth the potential risk of a fine, even if they believe they are doing everything right."
Well, as the article shows, the light's even starting to dawn on your Federal government and some states are ahead of the curve. Such sites need to start thinking about how much revenue they're prepared to cut off as more and more governments wake up to the fact that abusing privacy and lax security aren't desirable.
There's also a network effect. It depends on the sort of site but even if it's not the sort that has user participation the site that allows traffic from the EU is likely to get talked about in other forums than one that doesn't. Positive feedback will then draw more and more traffic away from the refusenik until it gets regarded as a backwater.