But forums are social media. Just as they replaced other forms of virtual communities, forums themselves have been largely replaced. Things new and improved supplanted what came before, even if some folks dislike change.
Forums like this one require technical and managerial expertise to setup and run, as well as ongoing time and expense. Places like Reddit, YouTube, Instagram, and Facebook take care of all that and more. Setting up an online community requires only basic computer skills and no expense, greatly lowering the barrier to entry. Sure, time and dedication are required to manage the community, but for people so inclined that is acceptable. The companies running those sites also provide basic rules and a framework to ensure things don't go off the rails. That helps to mitigate the sturm und drang that was so often seen on forums.
Like Billy Joel said:
"the good ole days weren't always good
And tomorrow ain't as bad as it seems"