Really big scoop (I don't think @BrianKrebs knows how big yet) here - he's tracked down somebody who says they are Rey from Lapsus$. I don't wanna say why yet as I don't have all the pieces of the jigsaw, but I imagine this is going to turn into a long thread over time.

Meet Rey, the Admin of ‘Scattered Lapsus$ Hunters’ – Krebs on Security