Your last sentence is key. As I understand it, there's no real legal precedent for IA which basically copies everything out there on an opt-out basis. I personally am glad they do but one of the ways they get off with it is by treading as lightly as possible, including respecting robots.txt even retroactively.
They're also non-commercial, broad in scope, arguably serve a valuable scholarly function and have other characteristics that have kept them mostly out of legal hot water. But it's unclear to what degree they're legally different from a site that decided to create an archive of all comics, commercial and otherwise, and slap advertising up.
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Your last sentence is key. As I understand it, there's no real legal precedent for IA which basically copies everything out there on an opt-out basis. I personally am glad they do but one of the ways they get off with it is by treading as lightly as possible, including respecting robots.txt even retroactively.
They're also non-commercial, broad in scope, arguably serve a valuable scholarly function and have other characteristics that have kept them mostly out of legal hot water. But it's unclear to what degree they're legally different from a site that decided to create an archive of all comics, commercial and otherwise, and slap advertising up.