Er, sure, except that they're completely different, because "weight" is a force, measured in newtons (or some scaled variant thereof) and mass is a fundamental property, measured in kilograms (or some scaled variant thereof). Don't go bringing any weird American "1 pound ~= 1 pound" nonsense in here.
Perhaps we need some new language to describe what they are actually doing, but Unlimited is not it.
You could call it the Fricative model. Flow is restricted but never Stops. By the way, my experience here in Australia is that they say it's "capped, but we'll throttle if you go over" as opposed to the other, which is "capped, but we'll charge your for excess". I don't recall ever seeing an "unlimited" plan here.
The moon is made of green cheese. -- John Heywood