Why don't they just do A-rounds for YC companies? Wouldn't that be the most obvious, and potentially profitable, play?
But all of the YC partners individually invest in follow-on rounds. (as individuals) I'm fairly sure that this is much more lucrative than what they make from YC funds.
But not sure that $39M will be sufficient.
Although, the more I think about it...."Initialize Capital" is an clever name for a seed stage tech fund.