This is a special post for quick takes by itaibn0. Only they can create top-level comments. Comments here also appear on the Quick Takes page and All Posts page.
While I like a lot of Hanson's grabby alien model, I do not buy the inference that since humans appeared early in cosmological history, that implies that the cosmic commons are taken quickly and so a lower bound on how often grabby aliens appear. I think that is neglecting the possibility that the early universe is inherently more conducive to creating life, so most life is created early, but these lifeforms may be very far apart.