Individually, cheating is an user experience and design problem. Did you ever play an engaging, interesting game, used a cheat code for more resources/lives and game instantly stops being interesting even if you don't use cheat codes any more? This happened to me multiple times. Experiences of others is similar.

"go out of their way to avoid actually learning anything, that shouldn't cause the site owner any grief whatsoever."

Obviously, Khan Academy staff has a different take on this problem and that's great. Online education should strive to cater to cheaters, too.