I'm still active on a UK car forum called PistonHeads. But the user base changed. We lost the calm, car-focused, informative nature of it.
The main website is still oriented around cars but the forum became overwhelmed with people who only came to post about politics. And their posting was more aggressive and confrontational rather than knowledge seeking or sharing. I can't prove it, but I'm certain some accounts are paid to promote / undermine political parties and causes. The product promotion has a harder time getting through though. And at least it's not Instagram or Tiktok.
The internet as a whole just isn't what it was.