I do not believe what UB are doing is any different than what other programs do. At the end of the day you make money with them and if you end up helping them along the way then the better.
Do not burn your bridges… since many programs go out of their way to assist you guys.
But Merlin if you feel what they are doing is wrong and will seriously affect your revenue then please drop one of the few remaining programs out there accepting US traffic and more to us.