In the regular world, this is easy to understand, because contract law is just a subset of the much broader rule of law. (slaw.ca)
I think it's fair to say that the call for more internet regulation has started to sound like a battle - cry for many in this space, whether it's additional competition, data privacy, telecoms, tax, or copyright rules as well as broader rules on liability for content. (lawyer-monthly.com)
If you follow the Supreme Court closely, you'll see time and time again that they use whatever excuse they can to decide cases on very, very narrow grounds, rather than routinely issuing very broad rulings the clearly apply to a wide variety of similar cases. (law.stackexchange.com)