Earlier quoted context omitted.
I thought similar. To me what Buzzfeed are calling the "old Internet" here is something I very much remember bemoaning as the "new Internet" in which dedicated protocols such as NNTP and IRC got displaced by brattish commercial upstarts whose web-based versions had 10% of the quality-of-life features and about 5% of the community etiquette. However they displaced everything that came before them because you could emb…
You're forgetting spam. Spam destroyed all those first generation federated systems. IRC survived because it was too niche for spammers to target much but spam is the primary thing that killed Usenet and email as a truly open system. The closed systems were better able to fight spam because they could easily ban people and IPs. On a deeper level spam, "brattish" commercial sites, etc. all come from when money got inv…
Unless the server allowed one to send email or post to usenet without having to log in first, then there's no reason why the provider couldn't simply disable the account or block the originating IP from connecting to the server. From what I can tell, the providers weren't interested in blocking spam by blocking IPs or disabling accounts. This is very similar to the robocall problem and phone companies not really trying to fix it.