Wouldn't the solution to that be to render in the cloud?

Then your problem becomes 'How to you monetize an app that costs us $20 in GPU cloud time every time someone taps a button'

Reminds me of deepart.io...

They started with a single GPU. As the waiting queue was getting longer, they made a paid feature that would let you get your results faster. Then they rented more GPUs with that money.

Maybe Uber will be interested!! They could embed it in their drivers cars