Because some women love calling men dumb or stupid online and then wonder why boys become incel/redpill men in the future.
I'm not saying that many men online aren't doing the same to women. I'm just tired, as a man, to go online and see memes diminishing men, and when I try to address it, nobody seems to care.
I think it's hard to host a video-focused social media on the fediverse, I imagine it would have a high cost to maintain.