Glitterkoe

But in the end it’s just as with email: providers, spam filters and clients. Some providers have stricter spam filters (~federation), some might prefer another client. Has there been any significant reason to deviate from that terminology?

Meaningful discovery is a major issue in adoption, though. Pro: no search/discovery algorithm that serves some evil plan of world enshittification. Con: no search/discovery algorithm.

Good for them. It’s an organisation’s free choice to pick the platforms they post and interact on, if any. Their presence is a service in itself while there are plenty of other ways to follow or reach them if needed.