You are mistaken, Verizon (and all carriers) impliment whats called a fair use policy. Basically it means that if you do something like hog bandwidth then your rate plan can be changed automatically to a metered one, or your service could legally even by terminated.
Excerpt from TOS:
You may not use our Data Plans and Features for illegal purposes or purposes that infringe upon others’ intellectual property rights, or in a manner that interferes with other users’ service; that violates trade and economic sanctions and prohibitions as promulgated by the departments of Commerce, Treasury or any other U.S. government agency; that interferes with the network’s ability to fairly allocate capacity among users or that otherwise degrades service quality for other users.
This is actually just one of several places where the fair use policy is mentioned.
Excerpt from TOS:
You may not use our Data Plans and Features for illegal purposes or purposes that infringe upon others’ intellectual property rights, or in a manner that interferes with other users’ service; that violates trade and economic sanctions and prohibitions as promulgated by the departments of Commerce, Treasury or any other U.S. government agency; that interferes with the network’s ability to fairly allocate capacity among users or that otherwise degrades service quality for other users.
This is actually just one of several places where the fair use policy is mentioned.
Well then, that's not really unlimited then, is it?
I may be mistaken, but the TOS doesn’t restrict the amount of data that can be used on the unlimited plan, but rather how the data is consumed. Meaning, you can use as much as you like as long as you're not tethering.