I'd be curious to see stats on overlap among startups by batch historically. My impression is that this has always been a thing. Based on where the market/technology horizon currently is, there are some buckets that are very "startup shaped". Founders who are iterating on ideas using similar criteria will often end up in the same proximity, especially in an accelerator environment. But it would be extremely interesting to see if this has become more prevalent over time, or at least since the explosion in the AI market.