The large US sites you’re worried about “dominating” the EU, who have significant EU traffic, will be able to comply with the GDPR and continue to compete just fine. They have the resources to hire the necessary phalanx of attorneys to advise them on how each feature and tweak to their sites interact with the GDPR, and it is a worthwhile investment for them. I was saying that smaller sites that don’t have internal legal departments and don’t need EU traffic should consider blocking EU IPs.