2) I'm positive YC companies get at least one special privilege - the ability to post jobs.
3) I've been told YC accounts are excluded from anti-spam measures, but I can't prove it.
EDIT: Also, regarding the zero-sum-game argument. All of us developers know we have limited time to spend on things. But a HUGE change to a non-priority that takes almost no time (for example improving the CSS on mobile) should be squeezed in between these experiments that may or may not make the content better, and take hours.