Oh, well post under your real name then, so you won't run the risk of being tainted by his money, ideas and connections, should the situation ever arise that you've done something he would be a part of. (And I doubt very much that YC operates this way anyway.)

What's that? It's too convenient to vociferously denounce someone for having an imperfect track record while doing something so grand that you could scarcely imagine the decisions he's had to make? (If you tried, that is.)

There's a reason why the word "anonymous" is often followed by "coward" -- it's abusing anonymity when you run to it as a shield from which to make pointed criticisms against actual people who will actually read what you write. Anonymity, used bravely, can provide a defense against the mob. Used cowardly, it's a defense against scrutability.