If everyone behaved the same as this guy, I'm sure that Verizon would not be able to offer the service at the consumer price.
70 Terabytes would certainly be the equivalent of "unlimited" to me. This isn't to defend Verizon, as I do agree that they could find a way to make the limits of their plan more clear.
I Suppose Verizon COULD, instead of using the term "unlimited" call the plan: the 50 Terabytes / month plan.
But, for typical consumers, this *IS* unlimited and those numbers just might make choosing an Internet provider more complicated. In fact, if my parents were asking for advice on an Internet service, I would indeed say: "oh, don't worry about those numbers, that pretty much means unlimited for you guys".
By adding these numbers to the plan, competitors could simply up the numbers, while adding no real value for the user. Even Verizon could even offer a 100 Terabyte plan for "only $20 more a month". The average consumer would see this as value, while in reality they would just be paying more.