I will start:
It was after I saw that it rebranded to “X”. Set my acc to private, logged out and deleted it from my phone over the course of a day.
I asked a similar question on Masto months before, and decided that it would be great to do it here.
I left around the time it was bought. I probably don’t have to elaborate much on that but it hadn’t quite felt like a place where I was welcome before, but it would be actively hostile after. And that did turn out to be the case.