The donation is also done in a sketchy way. Also near the bottom of the About page:
> How does this charity thing work?
> So far I'm using a solution that means I get payments sent to me to my Paypal and I personally make the donations to charities. I've chosen this way because it's easy.
In other words, you're paypal'ing money to a stranger and hope that the money makes it's way to charity
To the author's defense, he does have a "Are you to be trusted?" section that acknowledges this. The idea of a pay-what-you-like-for-charity-on-my-side-project idea is neat, but you need some degree of credibility or third-party to make it work. The next side project should be integrating against something that guarantees the promise of the donations.