And Twitter used to have free API access. And Facebook Messenger used to have Jabber compatibility. I don't think those companies deserve any trust in regards of promoting them for their open initiatives.

Threads' activity pub gimmick is just a nice to have. It's the salad of the Big Mac. If you're going to eat it anyway, sure, glad it is there, but it doesn't make it deserve a spot in any serious discussion about healthy food alternatives.