Out of curiosity, if you're able to answer it: Does YC now collect, or has it ever collected, (anonymized?) data/survey-responses from founders (YC alums or no

Out of curiosity, if you're able to answer it: Does YC now collect, or has it ever collected, (anonymized?) data/survey-responses from founders (YC alums or not) on their original motivations for starting the company, and attempt(ed) to correlate that with outcomes? If so, are you willing/able to reveal any of the things YC learned? If YC hasn't attempted to do this: why not?