Then it should be the responsibility of the EU people to avoid joining the fediverse.

The instances are providing their services in the EU, so it’s legally up to them to comply with the GDPR.

From your perspective, what should be the way out?

Honestly, no idea. I’m not even sure if Lemmy in its current shape violates the GDPR in the first place, but if I were the admin of a large feddit instance in the EU I would make sure to get advise from a GDPR consultant.

You’re right. If someone from feddit.de subscribes to a lemmy.world community, the entire content of that community is going to be copied to the feddit.de server and that’s the exact issue OP is referring to.

Maybe not IP addresses, but every post and comment you make is your personal data.