Is this even allowed? Wikias are supposed to allow transwikied material in some manner; it's one of the whole points of Wikia. Especially when we get those users who are clingy to their contributions (which is partially why these two users are leaving) and leave when they get merged or deleted and rally among a Wikia.
That's an issue for Wikia to decide, it has nothing to do with Wikipedia. This is the mailing list for the English Wikipedia only. Wikipedia is released under the GDFL, any wiki using a compatible license may transwiki anything they like, it has nothing to do with us.