[carlineng]

I'll let dcaisen speak for himself, but I don't get the impression that he believes DE Shaw is actively harmful; just that the service they provide (market liquidity, low spreads) comes at a relatively high cost. "How?" is a perfectly legitimate question, and it looks like a problem he's actively working on as the CEO of Proof Trading.

[auntienomen]

If he believes that, then he doesn't understand what DE Shaw's business is. It's like confusing a bakery for a flour mill.