Earlier quoted context omitted.
Well, the point of the GDPR is to make you aware that collecting personal data of EU citizens requires their explicit consent. Just ask me for it, that's not a big deal, is it? If you don't, you're effectively stealing from me and I shall expect my government to go after you to the full extent of the law.
What makes you imagine your government has any jurisdiction over me? EU citizens can choose to use services offered under other countries' laws, or not. The EU can choose to implement their own Great Firewall to block such services, or not. Frankly I don't care either way.
In extreme cases of non-compliance, avenues for enforcement that have been discussed reuse existing Anti Money Laundering mechanisms: once flagged in the system, banks will simply freeze your business assets connected to EU countries and you might be arrested upon crossing any EU border.