This is interesting, but I think most enterprise AI buyers probably aren't looking to buy from the current batch; they're just too volatile at that stage. This does seem like an opportunity for cross-pollination where early start-ups get to test their product signals and enterprises get to see what's on the cutting edge.

This seems more beneficial to the founders because the the enterprises could instead just choose to do some research on the start-ups. It's not like the start-ups are keeping their knowledge quiet because for them to survive they need to convince everybody what their doing is meaningful.

Right, the point of this from YC's perspective is to identify and pre-qualify the minority of enterprise AI buyers that can move quickly. Even those buyers aren't going to research and inbound to early-stage YC startups very often. The startups aren't intentionally staying quiet, but often they haven't nailed product-market fit and/or messaging yet.