Sun Express has never hired an agency to recruit the pilots on its behalf and has no plans to do so. Pilots sent by the agencies were accepted for testing as were those applying direct so one can cut the waiting time and spare some cash by going straight to HR.
Contracts that stipulate the penalties should be paid if pilot decides to leave early are both legal and enforceable - within Turkey's borders. There are folks who decided they will never, ever set their feet again on Turkey's soil so just left without goodbye. Then there was one who wanted to make clean exit so agreement was reached that working one year less than was contracted should cost him 21 000 € (quite less than originally agreed), payable by forfeiting deposit and working one month without pay.
Moving over to RYR makes financial sense if one already possesses some real estate near the expected base.