Usenet was a decentralized forum where anybody could participate and nobody could be banned. Despite this, the quality of discussion was usually very high. The user interfaces supported rather comprehensive threading and filtering capabilities, so you could block the people you wished you could ban. It was sort of destroyed by spam (since spammers couldn't be banned) but doesn't have much spam anymore because it's too obscure for spammers to bother with.

There isn't a Zoomer equivalent, because the internet has been locked down since then, and anyone who attempts to offer an uncensored and uncensorable forum gets brigaded and maybe swatted, then cut off from the banking system.

But Usenet still exists.