Dansup is a developer who made Pixelfed and Loops.

Depending on who you ask, he either fucked up Pixelfed in a way that exposed Mastodon users’ private posts, or else Mastodon implemented private posts poorly and he got caught in the crossfire. I’m firmly in the second camp, so much so that I think it’s misleading to describe it in that both-sides type of way, but regardless, that is the lay of the land of the drama.