No one uses this.

Estimated annual revenue of around $100M. That's half of Wikipedia's. Someone's using it.

No one uses them.

Quora alone has 400 million monthly active users.

Look at the rest of the internet. Literally every space, every niche, every congregation of experts has rotted away

None of that is true. Your institutional knowledge hasn't keep pace with the modern net. And your nostalgia has biased you against anything novel or unfamiliar.

You're rotting. The net is doing fine.