IRC is pretty good, and it survived the Freenode takeover by simply letting everyone know things are moving over to Libera.
Bluesky is awesome if you just ignore the "Discover" tab, I wish they'd just get rid of it. Librem One did something similar with Mastodon, it was peaceful.
After the initial excitement of finding decentralized platforms like that, I personally realized I don't care much for that type of interaction with people, so I don't use any of them very often. Same way I don't use my phone much, but it's there when I want it. Like a utility should be.
Mind you, we are talking about using these protocols for the general public, not savvy hacker news readers.
also what specifically are you worried about these 100 billion chatgpts doing?
I'm answering to that cost being a problem regarding "what prevents 100 Billion ChatGPTs from using any protocol?" - the context I have in mind for the above being scammers, political manipulators, spam, and people like that using ChatGPT/LLMs to take advantage of various protocols for profit (and the 100 billion figure being a figure of speech meaning "very many").
They mentioned identity being important here. I'm not sure what that means in this context (some kind of cryptographic verification, maybe?), but the part that seems relevant to me has to do with trust. Either a person is trusted by people I trust, or at least an organization I trust makes some claim about this person (e.g. they're actually human, this is actually their real name etc.)
I think we'll be seeing something like that in the mainstream in the not too distant future, for obvious reasons.