If they're letting literally anyone in, it's no more useful than every other founders mastermind group on FB.
Huge misfire by YC. Startup School had the chance to be a wonderful network of promising early stage companies - not only that, you've alienated a lot of the promising companies who were properly accepted.
YC simply does not have the stomach to deal with even an ounce of bad press, and it showed today. I would be very wary as a promising company to jump on board with an organization that will probably throw you under the bus rather than go through the fire with you if ever your company, for whatever reason, incites a mob.
I will no longer be applying to the YC accelerator, and from my conversations with other great founders, I'm not the only one.