Just because you can do something, doesn't always mean you should. I think my grandmother would hit you with a wooden spoon for asking that question.
When did I say anything about what they "should" do? Bad sportsmanship is not the same thing as cheating. If you're going to hand out playbooks to people with no real connection to your team, then you'd have to be incredibly naïve to think that no one else is going to see it. Is a team asking a released player for information about an opponent also cheating?