Why do you want to know? I can't imagine how knowing that answer is going to make anything better for anyone here. Are you a mod of a similar service and need something to negotiate with? Even as a negotiating datapoint, it's only valuable if YC would hire you to moderate (which I doubt) and you can use that as leverage.
If it was public, then random users might demand more of dang, thinking that his salary justifies it.
Keeping salaries public in an industry lets you use them as a negotiating datapoint anywhere in that industry.
Not too related to the discussion, but I'm really hoping Twitch moderators start asking for a paycheck once their streamer's realtime chat reaches a certain size, as they have to stay quick and attentive for hours straight. But sadly, they often start when the streamer is smaller and work for them on their own dime and remain that way.
If it was public, then random users might demand more of dang, thinking that his salary justifies it.