Don’t take this literally. We don’t like the ad model much. Its very unobtrusive and compromising to the user experience. The authors spend a lot of time creating content. And they need to make a livelihood to sustain their passion. For that, as a platform we need to help them build such mechanics.
Internally, we debated putting a “refund button” right next to the pay button. We think that would create much more confidence. But hey, this is the first iteration.