They probably got promises saying that they could continue to operate if they agreed to this Trump marketing campaign. That's enough?
In which case, the question is: what were other Republicans told that they didn't sign off on this plan? It seems quite a bit like a coordinated arrangement between China and ONE guy who was running for office.
Since he was running as a Republican, why are they not also signing off on all this? Why is the completely Trump-friendly Supreme Court not signing off on all this?