Europe could put quite some weight behind open social media if they would put official accounts like x.com/bundeskanzler on bundestag.de/@bundeskanzler instead.

Similar to https://www.threads.net/@potus but truly open by tying it to a government controlled domain.

I think ActivityPub supports putting a "look over there for the actual content" file on a domain, so that technically all you have to do is put a static file on the domain. And then you can use an external service to publish your content.