Labour and the Tories are trying to extend The online safety bill to put forum owner in prison if found to be causing harm (whatever that means) and you would have to pay for staff to monitor the forums 24/7 (no one is going to help out if they risk going to prison). All with a fuck ton of vagueness that can millions of pounds of fines.
That will make it impossible for anyone but big tech to run online forums.
You are not wrong though that running forums or any website with user generated content is becoming increasingly difficult for individuals, though the real culprits here on EU level are the recent copyright reform which requires you to remove infringing content quickly and the upcoming Anti-Terror regulation which requires removing content in one hour. Though it might be true, that many of these laws might be toothless against individuals or non-profits, even though they do not specially exclude them. But it really seems lawmakers don't think much of the internet beyond facebook, twitter and google.