There are a couple of things in this comment that aren't true, and I want to respond to make sure that people reading it don't come away misinformed.
YC does not distribute lists of "top companies" to investors, around demo day or at any other time. Quite the opposite - we take great pains to ensure that investors at demo day see all companies as equally as possible.
About other venture firms being investors in YC, it is true that Sequoia was once an investor in YC's funds, but that was a decade ago. We haven't had a venture firm as an investor in YC in many years to ensure there is an even playing field.