Except, unlike Reddit, it wasn't centralized nor owned by a single corporation.
Usenet users did not have to obey the rules and whims of any corporation and there was thriving ecosystem of feature rich, free and open Usenet clients.
I really miss having my own killfiles and regex search abilities that were common on Usenet clients, but is missing from the Reddit clients and its web UI.
The eternal September complaint comes to mind, but even eternal September was a jolly walk in the park compared to what modern social media has turned into.
Spam filtering has improved a lot since the Usenet days, but even if it hadn't we had killfiles to deal with the spam and filtering out harrasers. Doing this today would be even easier with the help of LLMs.