Yet, you have full blown communities with people creating art for their role models / artists. Take like pewdiepie and his subreddit, the creations there are nothing more than amazing, from video to even handcrafted art. Several artists have fun communities like this and they can interact with them directly.
Great point. Most people can create an old-school website with a little effort using few or basic tools, but creating something that can host a community is/was much harder. phpbb was about the limit.
It's almost an inversion - instead of many community sites, there are many users together on a smaller number of community groups, which are generally built on social platforms such as reddit and Facebook which make it easy to create them. It's not necessarily a bad thing, except that the most invested people in the communities don't have ownership of the platform or the data, so the communities that matter to them are vulnerable to any arbitrary changes in what the platform owners choose to do.
It goes even deeper than that. Take the term "X Twitter" or "X Youtube" where X is literally any subject, or group you can think of.
I frequent Youtube a ton and I noticed there are distinct communities on there like "Car Youtube" or "Gaming Youtube", hell there's entire communities built up around busting scammers on Instagram (those guys posting with stack of cash and a Lambo).
You start watching one channel and realize these guys do colabs with others in that space. Just a few months ago 3-4 Car Youtubers I watch got together and created "CarTrek" which is like a full blown TopGear esque car show.