Well the answer is yes, there are other E/O manufacturers around the world. It is just Turkmenistan's choice of using German E/O. Some other operators prefer Turkish E/O or sensors (SAR) or They prefer Wescam and even after the embargo the Wescam is still bundled with TB2 in some exports.Because is supposed there is a embargo, for everything, that's why. If there was no German company, could Turkey export drones? ΝΟ.
The embargo is for Turkish Armed Forces, for the export / re-sale the customer receives their own approval or solutions, or manufacturer (Baykar,assembler for you to understand with ease) brokers the process.
PS. Despite of the embargo by Canada, Baykar remains to be "Regional service granted with MRO rights" for Wescam products.