The old internet was hidden behind dial-up modems and TCP-IP stacks and weird telnet and usenet protocols. This complexity worked as a filter and the people using it were mostly academics, students, techies and other nerds (me amongst them). The moment uncle Bob could poke his way through social media on his phone from the shitter, the whole thing cascaded into Eternal September and "the old internet" was lost forever.

Trolls, bots, and scammers make them necessary at a minimum, and then the subliminal messaging from the cronies of politicians, etc. make them welcome. Bots are easier to make than ever before so you can't compare the past with the present that easily. kbin.social died last year because of relentless spam bots posting garbage/malware links 100x/sec.

What? The old internet absolutely had moderation, even back in the day of BBS.

I don't know what old internet you used, but the IRC channels and forums I used to run around on definitely had moderation. This was about '97. Maybe you're talking about the late 80s when barely anybody knew the Internet even existed and it was just academics and ubernerds?

Guess you never used forums.