So, I used messaging here in the broad sense. One possible application for it is instant messaging, which there are ActivityPub implementations out there doing that. But it can also be used for statuses or pretty much anything else that gets federated.

It’s not, the demo video actually shows that being one such use case. There’s nothing stopping anyone from writing a chat service in ActivityPub. But this can also apply to statuses, media, all kinds of other stuff.

It’s a different approach with different ideas. It uses open protocols, focuses on data and account portability, and incorporates peer-to-peer concepts in its architecture. The vision behind Bluesky is to build a global square with these concepts.

I definitely wish they would’ve extended ActivityPub and collaborated on the wider network, but I kind of understand wanting to start from scratch and not get involved with the cultural debt Mastodon brought to the network.