Usenet thrived in a time where most of us trusted each other, traffic was an order of magnitude lighter, trolls were few, spam was unheard of, and moderation - if any - was cheap and painless. I honestly believe those times are past us. And I say that as someone that loved Usenet back in the day. What you're asking for, for free , isn't possible.
The costs of transporting Usenet weren't zero, they were simply borne by your ISP because it was understood as a necessary part of internet access. I think that's what we're missing here. If we simply paid for this stuff as part of our regular internet bill again, we could solve a lot of the "nothing works for free" problems.
Famously so. "This message will cost the net hundreds if not thousands of dollars."