Chromecast isn't sold in Turkey. That fact doesn't invalidate your general point. But pragmatism easily wins when balancing all the real-world craziness of captive portals, ISP DNS hacks, and creative name-resolution optimizations against "but it could be grey-marketed in Turkey." This is especially true for a narrow-purpose consumer-entertainment appliance that already depends on other services provided by its manufacturer.

https://support.google.com/store/answer/2462844