This is from ProtonVPN’s website: https://protonvpn.com/blog/are-vpns-illegal/
Turkey
In 2016, the Erdogan regime began blocking VPN services and Tor. Now Turkey is using deep packet inspection techniques, similar to China, to detect and block VPN and Tor traffic. The rule of law has broken down in Turkey and the use of a VPN connection can mark you out as a person of interest for law enforcement. However, VPN usage in Turkey is quite widespread. The website Turkey Blocks monitors Internet censorship in Turkey.