The app can change the user agent string, but Web sites still correctly identify the browser and OS. Web sites have advanced browser identification methods and do not rely on the user agent string. So you will still see the mobile version of the Web site and Web sites that prevent you from viewing them on mobile browsers, such as Disney+, will still force you to use their app no matter what you change the user agent string to. Therefore, this application has no benefit from a practical standpoint.