Competitors There are a few competitors out there that do something very similar (see https://ruttl.com/, https://usepastel.com/, https://bugherd.com/, https://www.markup.io/). This seems to suggest that there seems to be a general market for such a product. Source: about 1 year ago

Yes, we used Pastel https://usepastel.com and it was very nice overall. - Source: Hacker News / almost 2 years ago

I believe https://godvillegame.com/ is very close to what you are aiming at. And they have pre-moderation that takes months (that is, your game has to have that much time). But apart from that I was enjoying this game for around 4 years and creating content was maybe the most fun part of it, even as only 2-5% of the creations were accepted. Source: over 2 years ago

Godville (https://godvillegame.com) seems inspired by it, but taken to 11. You can play as actively as you want, but you can also close the tab and not return for years, and your character will happily quest/level up/buy/sell/eat/fish/heal/revive/change guilds/get drunk/etc. On its own. IIRC it even allows spending money if that's your thing. - Source: Hacker News / almost 3 years ago