AMEX points can go to anyone's account, something else must be wrong.
most people I know who asked that the Pts go to someone else were told , we will allow it just this one time. cant tell ya how many times I was told that, but I believe the T&Cs dont allow a transfer to anyone but the members own accts
but saying its going to a BIL or SIL MIL FIL usually attracts less attention. Now Id expect if aperson wants to sell their pts to many people in a close dateline that they can run into some trouble, especially if its a pretty new opened acct