Amazon Underground.This is an interesting step toward eliminating the scourge that is F2P.
As someone working on the publishing side of mobile game development, I feel ambivalent. I would very, very much like for the F2P model to die in a fire. Unfortunately, it currently makes us a hell of a lot of money. That's why we keep making them.
Because Amazon is paying per minute used, this is changing the scope of what games are developed for. Future games might be put together with this model in mind, but the current games are not. We all want to make games where the person wants to keep coming back and playing more, but the average usage of a user is way less than the average revenue per user. Considering they're paying something like $0.002 per minute per user, it takes a lot of users and a lot of play time to get closed to revenue from IAP.
That in mind, developing a game with an eye toward length of session versus value of IAP to
speed up the game, is very, very risky unless this model proves ridiculously successful. The Amazon marketplace for apps is SO very much smaller than that of Android or iOS, too, meaning we can't bank on volume so much as length of session. That means that we are still going to have to make games with the F2P IAP and ad-supported models just to make money. Nothing will have changed.
In short: making games optimized for play session length
and amount of dollars spent per user is hard, and the first is a financial risk, so I don't see F2P budging.