After the huge @bellyrub scandal and scam if you try to send to that account you see this:
"Use caution sending to this account. Please double check your spelling for possible phishing."
They at least red flag the account as a possible scam. There is nothing still after MILLIONS stolen by poloniex.
So I'm wrong and you are right. They are willing to do this and it should be done for this exchange. I guess they are afraid to alienate one of the few exchanges trading steem.