Halo 2 and especially Halo 3 multiplayer saw thousands of game styles spawned outside what the devs at Bungie initially thought (griffball anyone?), give the tools and a good gameplay loop to gamers and a community will likely spawn around it very easily. Compare that to the hollow shitfest of the "metaverse" trying to commodify everything (cuss tech capital is running out of monetization pathways) and it's really clear you can't just artificially astroturf a community that wouldn't naturally form.