You jest, but in fact, MPAA, RIAA, absolutely -have- in the past tried to mandate, lobby, require that enterprise devices do L7 inspection for exactly this reason. They have been more than happy to argue that their member's products should have explicit preventions in third party hardware and software (at the third partys expense, of course) to protect revenue.

And on the flip side, certain firewall providers have marketed similar features to restrictive regimes such as China for the Great Firewall. And not just 'nudge nudge wink wink', but produced marketing material saying "This will help you prevent Falun Gong material being available, and help identify end users trying to access this material."