Maybe that’s your clue that your idea is bad then? YC likely has decided it’s not in their interest to badmouth your idea, but if you are making the 20th data pipeline company in the same batch, maybe the smart thing to do is take a step back and ask yourself “is this really what I want to spend 5 years in?”

From what I hear in the YC YouTube videos, it’s clear that the partners quickly form an image of how much brutal feedback you can take and measure their responses accordingly. My suspicion is that they are unable to gauge who’s good at that brutal feedback until you’re well into the program and they would rather have 100 grifters for that one golden founder who can truly take feedback. I suspect that one founder gets a very different treatment from everyone else. Clearly OP was not that 1 in hundred.

If you approach YC with this mindset, you can make a decision before you even join whether this is worth it for you - are you ready to easily take brutal feedback and adjust or are you like OP going to double down on marketing or whatever you think is the key to succeeding? In the latter case just don’t bother I guess!