You would have to check each user documents like a passport to confirm they don't have EU citizenship. Even if you have one EU user (doesn't matter if you block EU IP addresses etc. they can still use VPN) you have to comply with GDPR. If you have "significant" amount of EU users then you are also liable for the upcoming terreg regulation that requires you to set up a legal entity in the EU for the purpose of censorship. You will have 1 hour SLA to delete any content that EU deems to be undesirable. If you have any user generated content it also means you are likely be mandated to use content filters in the EU.

Have a read if you don't believe: https://decoded.legal/blog/2021/04/the-eus-terrorist-content...