No one with any sense would leave a job to go work for THY on a one year contract. The agencies that are recruiting pilots for THY are quick to tell pilots that the one year contract will probably be extended to three years and that the initial one year offer is a labour law issue. If you think that this statement makes sense then you are in a majority of one.
Because THY are unionised their pilots do not want expats there. After you have finished your one year contract you can expect to be shown the door.
Maybe THY would be more successful in getting non desperate pilots to join if they were to offer a contract that was three years in duration.