Been over for a long time. We've had a lot of consolidation into Reddit (which, you can browse mostly anonymously, it will just beg you to death to log in unless you use the old site); and we've also had a mountain of consolidation into Discord (the most unsearchable system ever designed).
People stopped hosting their own forums. Frankly, it's hard to not see why. The constant spam and people avoiding bans wasn't helpful - and modern forum software like Discourse is pure agony to set up and maintain if you don't know what you are doing. Not that forum software hasn't always been hard to set up, but the modern software stacks are particularly hard to manage. Also, what normal people see as good UX, in my experience, almost completely does not match what computer engineers and the average open-source contributor sees as good UX.