As an attempt to diffuse a "situation" before it evolves, I'd just like to point out that the footer is also displayed via a theme function as mentioned above. This means a dev can keep an override function handy so that the footer never makes it into the HTML at all. I don't think the footer's coming out any time soon, but it can certainly be modified/made nicer just like any other part of the code. I like the idea of an optional button or a simple "Powered by Ubercart." message. And I do agree that it isn't really an ethical question, but I do appreciate all the support from the folks using the cart.