> so they don't need to respect robots.txt You mean they don't need to respect copyright law? So it would seem. If a user wants a legal copy, they can choose

> so they don't need to respect robots.txt You mean they don't need to respect copyright law? So it would seem. If a user wants a legal copy, they can choose File -> Save Page As. The copying isn't the problem, the reproduction without ads or paywalls or respect to the owner's copyright is.