It also isn't nearly as tight as your 2.2 hours suggests in practice. Gigabit is fast enough that most downloads take seconds so the chances of someone spending hours at full speed is pretty low.
Unlimited is definitely nicer
Also I don't think your reading of their offerings is right. 1.2TB allowance on the basic package and those that want more can purchase an unlimited package:
So the analogy you proposed would say that streaming video is abuse. The analogy is wrong.
Also, when talking about how "most downloads take seconds", video game (re)installs can be over 100GB. You could have two people each install two games and blow out half your data cap in an hour without doing anything remotely unreasonable.