Have you bothered to read COS18? It’s on a much lower cost base than even C scale, which would become B scale light after that introduction really. Without any guarantees at anything. Ever.
They can complete the training at their own expense, a lot of them are almost done anyway. With the added benefit of sticking CX the finger and going to HKA or XMN I fully understand their sentiments.
In the real world, when you f*** someone over, there are consequences to such action. Usually out of principle. If these guys and girls decided to walk I only commend that.