One can't punish a person for wanting to know the result of every application he's made......you may call it vanity or whatever else you want to.
Well...let's see if one can or cannot punish the person if the person has breached a material clause of a contract....of course....'one' means NYU. The contract specifically asks the grantee to withdraw....not to 'not to' accept other offers. It doesn't take a nobel-prize winner to understand such a simple requirement...but of course it takes some ethics.