Why is there no substantial subreddit for Dark Pools? Huge missed opportunity imo

There is a subreddit r/darkpools (which I just joined) that has a meager 300 users.

I can't help but feel we have a missed opportunity for knowledge regarding dark pools and everything regarding after hours trading being concentrated in a subreddit where such knowledge and news can be pooled by the educated and informed regarding this topic and related.

If there is a subreddit I am missing, let me know. Or if there are alternatives on reddit, let me know. Maybe I am missing something. Maybe I'm just clueless.

Looking forward to thoughts and feedback or mockery of my run-on sentence.