I'm honestly curious how you envision that affiliate links might create the wrong incentives. There are other ways to make money, but the ones I can think of seem much worse. Advertising sucks and clearly has more wrong incentive problems. Donations are less predictable and disconnected from the usefulness of the site. It seems to me that getting a small cut of "hey this book does look useful, I think I'll buy it!" is as well-aligned as it gets. But I'm interested in your thoughts on this!