If BM and the dev team really don't want account transferring, perhaps they could implement an 'account burn' feature, which allows you to permanently disable an account from sending/receiving/transacting. Any person attempting to send this account funds would get their funds sent back, with the memo that the account burner used in their burn transaction.
On second thought, maybe the memo feature would be too useful to an account hacker, eg "btercom has a new address, please send funds to xxblademasterxx for all future deposits instead."