I'm sure a lot of it is pure slop, just a bunch of prompts and a CRUD app. But I wouldn't be so quick to assume that anybody talking about "AI" is just a bunch of prompts.
Without looking carefully, I can't tell which ones are generative AI / boiling the oceans to bullshit you; it's possible that some of these are legit uses of machine learning, which existed before ChatGPT and will hopefully continue to exist in the future. But I bet it's all ethically questionable bullshit.
Forerunner AI jumps out as a likely ethical black hole, based on its one line description "Copilot for aerospace engineers making rockets, munitions, satellites." On top of code theft, water use, emissions, and the many other horrors of Copilot and its ilk, we can also add war profiteering.
EDIT: Prediction: YC's next batch will include a startup trying to replicate whatever the fuck this is: https://www.972mag.com/lavender-ai-israeli-army-gaza/
So no, not a requirement. OTOH if you do come with an AI idea, they won't reject you just because they already accepted a few hundred others :)
YCombinator is a tech investor, of course they are investing in the future. It just so happens that in this current tech cycle AI is the future.
I think the term you're looking isn't "future," it's "hype."
I just saw a realtime generative minecraft demo, your head is in the sand if you think this is hype.
Wait, that demo wasn't a joke?
The old guard have put earplugs in and wonder why everyone's dancing, they just can't hear the music. In this context it's their refusal to try anything and attempt to downplay everything. The technology will move on, with or without them, and that's the most beautiful part.
You can hate the marketing of AI, you can hate people starting startups to take advantage of this new technology, but you can not stop this technology from moving forward. They will fall into the same category as the people who denied the impact of the Microcomputer, the Graphical User Interface, and the Smartphone.
That probably played a part I. The development of CRDTs, which are straight up magic.