Very strange hearing such stories.
I remember a company I worked for went through a YC interview.
We were rejected with "we are not sure you can deliver".
At that point, we had built 2 mobile apps, a big customer wesbite, rich portals for partners, contractors and admins, had thousands of customers, were almost profitable. Our CEO had a history of delivering in that he sold his previous startup.
I must sound bitter, but it's pretty gut-wrenching when someone gets throgh by making UI mockups during a zoom call.