The problem that's fundamental to the Internet is something nobody wants to say, So I will: the people suck. Not everyone deserves a voice.
The comment sections on WaPo, the NYT, and DailyKos are just as bad as the worst parts of 4chan. And nextoor/facebook? These people are whacked out.
Usenet worked because it was a sub-elite; in the golden era people in usenet were college kids, the highly educated, etc. and even with that there was more self selection, because you needed a computer and the ability to read and write text. And connect to it, which if you weren't in a university was quite difficult.
Is anyone willing to build a service that's got elitism built-in? Clubhouse sort of did. But it needs to be said: allowing anyone to post means dick picks and moderation.