For something so easy to duplicate (40m users) I see frighteningly few duplications (photo services with 40m users after 18 months.). Making a camera app that

For something so easy to duplicate (40m users) I see frighteningly few duplications (photo services with 40m users after 18 months.). Making a camera app that has filters is easy to duplicate. Aggregating an audience of 40m users on no advertising is not. Period. EDIT: "on no advertising" should read "on no marketing".