Earlier quoted context omitted.
1. It got spammed to death. 2. It lost control over its culture, and that culture was crucial to its functioning. 3. It was too problematic for ISPs (or others) to provide ready access to it: spam, harassment, child pornography, and copyright violations all posed massive concerns. 4. There was no viable business model for providing the service. https://web.archive.org/web/20230603024330/https://old.reddi... > (I'm au…
If you were to ask Usenet at the time, they would chiefly cite the eternal September (which you do mention in your article), although, clearly, it kept going for longer than that. Perhaps the eternal September is just one of the contributing factors to losing control of its shared culture and values? https://en.wikipedia.org/wiki/Eternal_September
Transitions aren't instantaneous, and aren't always clearly visible at the time. (Look at, say, the present ... evolution ... of Birdsite, The Front Page of the Internet, and the StackExchange empire.) But in retrospect inflection points become more clear.
(This is pretty much a constant in all of history, with eras, transitions, and labeling of these coming years, occasionally centuries, after the events themselves.)
The Eternal September was one of a growing onslaught of insults to Usenet which it ultimately succumbed to. Not instantly, but in time, and inevitably.