AGPL isn't viral or contagious, it's copyleft. You need permission from the author to copy. If you violate the license terms you're copying something you're not allowed to copy. That's a copyright violation like illegally downloading music and the rights holder is allowed to tell you to stop doing it.
Oh I agree! And I think it's straightforward to comply with.
I was just explaining the common legal concerns that pop up with the license, and that too much 'contagion' has historically been a gripe about its lack of case law.
