Mastodon is pretty different to its competitors. It looks similar to Twitter / Bluesky, but the way the social network functions is completely different.
It's designed to be anti-infuencer... One of the things I hate about most social media platforms is a few people get all the attention. There are a few reasons for this, but it's not really based on merit.
I think a lot of people joined Mastodon wanting a Twitter clone. It's obviously not and Bluesky is, so people moved there. The approach Mastodon takes is far from perfect, and may not work out in the long run. But it seems like it's worth at least trying something different.
OpenAI published a paper about GPT titled "Sparks of AGI".
I don't think they really believe it but it's good to bring in VC money