It is not something that we decided about, if you use tourism services of any company in Turkey, you need to support all these passengers names, family names and passport numbers. There is a process named  UETDS Unscheduled Passenger Transport Notification Procedures ( UETDS Tarifesiz Yolcu Taşımacılığı Bildirim İşlemleri ) that submitted by TURKEY tourism ministry and all companies must fulfill it. So after your reservation we need you to provide these details.