Right when they first started the Uber crackdown, I know of one person (passenger) who got a ticket, which they ultimately did not have to pay. Like so many things in Turkey I have heard incessant rumors of passengers getting fined, but I know of no one personally that has has this happen to, and I myself have been in 4 Uber and Careem's that were stopped by the Police, and have seen them get big fines, and even a tow, but to date have never been threatened with a fine. That being said, if the Police are cracking down on a given day to the airport, you will find that Uber's will not go to the airport, or v/v you will find that they simply won't pick you up.