Seriously?
...it included user names and passwords for email accounts, social media websites, and financial institutions; Social Security numbers; medical records; private emails to doctors; bank and credit card statements; and webcam pictures of children, partially undressed individuals, and intimate activities at home.
You could argue that the computer rental firms have a perfect right to protect their property from theft or delinquent customers by installing such software.
You could argue that but I wouldn't suggest trying it face-to-face with the renter or you may become rapidly acquainted with Mr Darwin's theory.