Twitter – the concept, not the collection of servers and contracts and code – is something so much bigger than a job. It's the most visceral representation of human communication and ideas that we've ever created. And how do you let *that* go? (no seriously, if you've got ideas!)
That's another aspect to this that is so poignant for me, personally. I tried to make Twitter better. I tried to make Twitter the fediverse, back in 2008, and after I failed, I left and tried to make the fediverse a thing without Twitter.
That was not an easy task. For a long time, I truly felt it was my fault, personally, that we failed. The enormity of Twitter became oppressive, because it was so obviously the wrong thing, corrupted from its potential by capital and a lack of imagination.