So, I'm not going to name specifics, but I do hate that certain niches have tons of forums/groups/etc. Usually someone will get upset at a communities staff or leadership, splinter off, and start their own forum which is basically a copy of the first one, and try to draw away members.
For example, in the past, there was 1 or 2 tile forums where pros met or homeowners came to ask questions. Now there are like 35 different Facebook Groups for the same thing. They even bicker and war and verbally attack the other groups. It's almost like a gang, lol.
I wish there were more forums based around specific Youtubers, or just a general Youtube forum. I feel there were more back in the day when Youtube was brand new and forums were more popular. These days I feel like most Youtubers either have Facebook Groups or Discord servers.
There are fewer and fewer, that being said there isn't much competition like there was many years ago, well 10 years ago I would say. and so the forum niche we have nowadays is dead and nothing new to offer in most cases.