Shared fiction communities happen naturally when you have simple rules and a strong appealing grounding (visually, intellectually, ritually, or otherwise).

See: Minecraft, Sonic, MLP, SCP, even Bored Apes Yacht Club for 15 minutes

Which is me agreeing with you: this seems too hard to get; there's already 4 timelines and no faces to get attached to.

So why wouldn't I just write my own stories unrelated to this?