I’m not sure when you were using it, but Navidrome definitely let’s you play individual songs and shuffle.

I also don’t see how the term applies only to ActivityPub, wouldn’t any federated protocol ecosystem be a ‘federated universe’?

Matrix is federated though, so why wouldn’t it have something to do with the fediverse? Is that not the definition of the term?

Yeah this is why I don’t use cloudflare, I have my domains on porkbun.

Based on this it looks like the user can choose article or note: https://github.com/Automattic/wordpress-activitypub/blob/163d9e931c407463bf254ce55bd45f400468982c/templates/settings.php#L158