I don't think so for anyone who transferred over. You agreed to their terms/conditions when you jumped to a server with a free transfer with more stuff bring-able. New servers only become congested as everyone flocks to it/makes new characters on it. That wasn't covered in anything they said about the transfer, so it shouldn't be lifted.

'These bonuses will remain in effect until the active player population of Congested and Preferred Worlds has stabilized, but please note that the population status of a World is subject to change.'

Anyone who jumped to a new server should have known what they were getting into.