Well but that would be great, I'm too young to have been part of that magical usenet era that people talk about with such reverence, and these days I have no idea how to get on there, if there's anyone on there I might care about, or whether it even still exists. So a new usenet with extra steps (and, uh, accessible through the http protocol) sounds great to me.
USENET never really solved spam. I remember the statistic that at one point one third of usenet traffic was spam and another third was spam cancels. Here's what people felt at the time: https://www.eyrie.org/~eagle/writing/rant.html
(the "cancel" message was hilarious since when invented it was unauthenticated, i.e. anyone could delete any post on any group in USENET! This had to be fixed:
