I'm a little concerned also. I always liked that most of the money went to servers and bandwidth. I don't see any reason to think that the foundation should be the ones spreading books to africa etc. I'd rather they just focus on keeping the website up, and the information free; but organizations, without strict bounds will tend to grow.
Unfortunately it's probably too late. If you stop donating now they will think of other ways to make money, there are certainly many options available.