Would you guarantee that any system you build/manage will be safe?
The point is that Sony is disclaiming responsibility for anything it does wrong.
It's like saying, "Well, I'll work as an engineer for you, but I refuse to be held responsible if the bridge collapses." Even the nuttiest libertarian could find reasons to pass laws forbidding that kind of contract. And even if it's legal, I wouldn't drive on that bridge. (Or would I? If everyone does it and it looks safe enough...)
This is even worse when I think about it. It's more like buying a plane ticket, being in the airport, and suddenly the pilot goes "I am not legally liable if I crash the plane while I'm drinking on the flight."
nope. you can still go to arbitration or small claims.
If I leave an outdated version of SSH open to the internet, allow root login, password authentication, and set it to 'p4ssw0rd', then I'd fully expect to suffer some consequences.