This business also wouldn't be viable if Apple and Google had never opened their platforms to external developers in the first place. Or if they never existed and everyone still had really advanced Nokia phones with T9 and SMS.
Or perhaps their business wouldn't be viable if iOS and Android were Windows-esque free-for-alls with rampant spyware and malware, making a good portion of their potential user base wary of installing apps.
Or perhaps their business wouldn't be viable if people haven't become accustomed to spending money in App stores without worrying about credit card fraud, etc.
Or perhaps their business wouldn't be viable if iOS and Android had no mechanisms to protect against app piracy, and 30% of their potential customers pirated the app.
Or perhaps their business wouldn't be viable if iOS and Android were Windows-esque free-for-alls with rampant spyware and malware, making a good portion of their potential user base wary of installing apps.
Or perhaps their business wouldn't be viable if people haven't become accustomed to spending money in App stores without worrying about credit card fraud, etc.
Or perhaps their business wouldn't be viable if iOS and Android had no mechanisms to protect against app piracy, and 30% of their potential customers pirated the app.