Inspired by
this discussion, I thought a bit about the possibility of a Bitcoin ATM machine which does not need any entity which "custodies" your Bitcoins.
I'm not an expert, but I don't believe the need for an ID at an ATM has anything to do with custody, and all about AML. When do they hold your bitcoins/money for you? Don't you put money in and it sends bitcoins to your wallet? I have never used one, so please enlighten me.