The last YC batch was like ~170 companies, correct?
Each year, there are like 150 million startups. So let's not take YC stable for the whole startup ecosystem.
And I'm with you with a critical view on their all-in move toward AI. It's just what all the VCs do, and it's hard to say who's parroting who in this setup (I think that others are parroting YC, but feel free to challenge me on that).
Having said all that, I wouldn't be surprised if a couple of companies from this year's cohort made it big. If you look at YC's biggest successes year by year, you will often (but not always) find a household name.
Was there anyone who predicted these would be the greatest hits? Of course not! That's the whole point of having an investment portfolio. You can be wrong a lot of times if you secure an early investment in a unicorn every other year or so.
Also, "one recent example" of poor investment decision doesn't invalidate 2 decades of rather successful investment portfolios (as a whole, not individually).
In no way is it a YC defense. I'm very critical of the whole startup funding ecosystem, and they are a prominent player. Yet, if they were consistently stupid with their decisions, they wouldn't exist, let alone be the most desired accelerator out there.
Also, if it's that simple to copy what they do and what the companies in their portfolio do, why wouldn't Google et al. take their almost infinite funds and get the competing offers for non-BS ideas up and running in no time?
I bet that if you had an idea that could pay off thousandfold, you'd get enough eager ears to hear you out in any big tech. And still, it's the makeshift mass of startups that come through with new products.
One has to wonder why things like Shopify, Stripe, Zapier, or Figma did not come from the big tech. Each would have an ideal match. Even if you look at the AI landscape, how come Lovable made such a career? After all, they repackage the AI capabilities rented elsewhere. Somehow, with all the ingenuity of building ChatGPT, OpenAI and the rest didn't get it.