Why do freelancers have to go to such efforts to ensure data privacy?
If your clients operate throughout the German-speaking world and in neighbouring EU countries, your job will involve a lot of travel with regular overnight stays. You probably often use public transport for these business trips and travel frequently by plane and train. On the way, you make use of the travel time to plan appointments, allocate budgets and resources, and also to provide commercial and operational support for complex projects.
Of course, all these tasks are highly confidential as information is usually only shared with an extremely limited group of recipients. Your client expects you to work with utmost loyalty and integrity?