I recently started a related project via @chimerahearts.com to create a web of TTRPGs, linked by their inspirations, in a community-built, wiki format:

ttrpgtree.miraheze.org/wiki/Main_Page

We landed on a wiki, and have been ironing out formatting and organisation, with only a handful of games added so far.

Now we're mostly happy with the setup, we'd like the wider community to get involved. Please, add your game, or any you have a copies of!

ttrpgtree.miraheze.org/wiki/Main_Page

I am VERY aware of Fandom's issues, so we've dodged that bullet from the start.

We landed on a wiki, and have been ironing out formatting and organisation, with only a handful of games added so far.

Now we're mostly happy with the setup, we'd like the wider community to get involved. Please, add your game, or any you have a copies of!

ttrpgtree.miraheze.org/wiki/Main_Page

In short, every shithead you don't ban costs you ten other customers.

"A [potentially regular] customer doesn't say anything but never comes back" doesn't register with you as An Event the way that kicking someone out (temporarily or permanently) does, so it's extremely easy to miss it.