score:6
I'm local.
I just called to Turkish Airlines hotline for you and it sounds like the "randomized selection" and "fever control" is kinda over but there are still some requirements to fly depends on which country you are right now.
They directed me the page called Travel Rules of Countries to check on a map (somehow the map only loaded on Chrome, failed to load Opera and Edge) what PCR requirements are needed by entering your passport information, your country of departure and destination, and your vaccination status. Sound like they usually asks for fully vaccinated (2 biontech or 2 sinovac) or not.
You can also call the hotline yourself on +908503330849 and press 9 for English.