I mean, that's the thing, I heard a lot of PR about people interacting with celebrities, VCs etc. And people saying the _format_ was great as it attracted all these people. But the reality was the novelty attracted these people, and a VC that spends all day chatting with randomers won't be managing their investments very well so they would need to dial back, and the celebs who were enjoying the novelty were going to realise that any venue to interact with fans is capable of consuming "all their time", and want to go back to putting it back in its time limited box, so that aspect of the appeal was never going to last.

Then for the randoms talking to randoms type groups, voice chat is a big increase in commitment over Reddit/HN/whatever. You could argue that encourages better contributions, but it also discourages frequent contributions, which in turn helped the "fizzling out" effect