It only takes a few flags to kill a fresh submission. Anything referral or similar is doing to have a high flag risk. It may not be a rule violation but HN is

It only takes a few flags to kill a fresh submission. Anything referral or similar is doing to have a high flag risk. It may not be a rule violation but HN is supposed to be self moderating. Up and down votes help garner a consensus over encouraged behaviour. Doing a bit further are flags. I can well see people flagging a promotional code. I and many others come to HN for the discussion and we would be very disappointed if HN become a coupon hub.