The thing you gotta remember about this is that YC etc are Venture Capitalists. They're a subset of the funding industry that is primary concerned with funding

The thing you gotta remember about this is that YC etc are Venture Capitalists. They're a subset of the funding industry that is primary concerned with funding extreme long-shots that have a small chance of becoming massively and wildly successful. They're not out to build stable businesses or to make the world a better place (per se), they're out to find the unicorns and get in on them early in hopes of wild profits, enough to outshine all of the attempts that fail dismally. Of course they want the founders to be like that, that's the entire purpose of their operation.