As someone who has been waiting for the same thing as op tyre posted, I went to investigate this claim and it seems that it might be true but only when running apps within the Google AI Studio itself.. ie if you were to make an app that was on something like the App Store using Google AI Studio, it would be back to an API key that the developer bears the costs for.

The problem with the current model is that there is a high barrier to justifying the user pays essentially a 2nd/3rd subscription for ultimately the same AI intelligence layer. And so you cannot currently make an economically successful small use case app based on AI without somehow restricting users use of AI. I don't think AI companies are incentivized to fix this.