I don't know of any either and I'm on like 40+ servers probably. I've run our weekly dnd on it for years without issue after trying the other options. Get that it's not good for tracking and documentation in any official capacity but it's pretty damn good for active niche interest communities.
The music production servers I'm on are a perfect use of the platform IMO. There's a server run by a guy who manufactures an open source tracker device, and there's channels where people post works in progress, get help from others, there's streaming events where people can submit songs they've made using the device, etc. There's a bunch of people popular in the music scene who regularly help noobs. Always ongoing active discussions, everyone is polite, there's a lot of knowledge shared in real time.
So when people are like "Discord sucks use my favorite platform instead," I'm just like I don't even care about the platform I just wanna be where some cool shit is happening and your platforms are fucking boring. Show me the cool servers on your platform then so I actually want to use it. It's the idea of these platforms people like, and I like it too, my close social group uses a privately hosted Matrix service which I use every day, but I've never found a comparable community on these services outside of this use case.
Yeah I just scrolled passed that shit cause it shocked me too much to engage. Not exactly proud of my b-slur days, but also wasn't the best time in my life, and there was something oddly welcoming about the site back then. A site where everyone called each other a f*g in ironic comradery vs having it thrown at me by homophobes. Would have never associated the site with anything good though, using it was like willfully exposing yourself to something insane at the click of a button. If you were the right mix of computer nerd and socially isolated, 4chan offered something that you couldn't get anywhere else.
Almost 20 years later I actually value the experience of being on 4chan more because of how influential it became to online culture, and later how politics happens on the the internet, and the demographic who uses it becoming so identifiable. It's very rare but on a few occasions I've come across normal people in real life who were b-slurs at the same time, and it's crazy how recognizable it is.