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You have a valid point there @mister-t, but I do believe that Google might just have a chance Duo.

The only reason why I believe that Google has a chance with Duo is because of the cross platform compatibility, which is something that FaceTime doesn't offer at this time.

But then again there is user adoption, and the question here is whether or not users will go through the hurdle of downloading an app just to video call.

Only way I can see it getting mainstream use is if they make it the default app for video calling on android.