Rather, it makes more sense for them to add it so that if someone does debug their site, it gives Netflix a legal precedent to press charges against them for hacking their site by bypassing a security system.
These companies lose more money to fraud in a quarter than they have ever lost due to people exporting their movie ratings, or whatever other non-criminal acts people have been committing at the console. I don't understand why we need to posit a 2nd (more sinister) motivation.
It's like those tacky trailers at the start of a movie "pirating movies is illegal". First question the judge asks - what steps did you do to prevent pirating and when did you notify your customers.