I think it kind of makes sense for the EU.
All official sites of the EU are under europa.eu. That’s just a rule.
Then there’s the social network. But they are completely different branches - you wouldn’t necessarily want the Court on the same exact site as the Commission, because even though they are both part of the EU, they are completely different branches. Keeping the Commission (EC) separate from the Court (curia) makes a lot of sense from a Montesquieuan understanding of the state.
If the US institutions joined Mastodon, we probably wouldn’t want the Supreme Court, POTUS, and Senate to all be on the same instance, because who would be trusted to run it?
That said, it would be nice if social-network.europa.eu provided a landing page linking all the official profiles of EU institutions.
I have no idea whether it’s a valid point or not, but Finding Nemo was 21 years ago. Not sure that counts as “nowadays”.
Onwards is from 2020 and is all about death. Coco is from 2017, I should really get around to seeing it.