A friend of mine was currently undergoing the flight attendant course with Qatar Airways. One week later he received a phonecall from Emirates saying he was successful of the interviews he attended two months ago in Malaysia, before he left for Qatar. He decided to leave for Qatar a few weeks later since he hadn't heard anything yet.
The CEO of Qatar Airways threathen him if he did leave Qatar, he would send a copy of his passport to the UAE which could him from working with Emirates.
Is it really that bad?