With all the people wishing for forums but not wanting to host, I'm surprised nobody had made a Discord-for-forums. Threaded, not reddit.
Some examples running it
... and it always surprises me a bit that people just assume Discourse is the only option and stop looking.
Look at Flarum, look at NodeBB. Both are making strides while staying true to the original forum threaded model.
(N.B. I maintain NodeBB)
Discourse forums still need each owner to set up and pay for hosting.
Running a site that is primarily community content and profiting from ads always seems a bit scummy to me. Particularly odd that this one is co-founded by the same Jimmy Wales better known for Wikipedia.