The only abuse is the use of the English Language
Unlimited - "not limited or restricted in terms of number, quantity, or extent."
So pedantically, if are using only 75TB of unlimited, then by definition you still have an unlimited amount of space available, those using 1G are using the same percentage as those using 75TB.
In the real world of course that's clearly nonsense, but on planet Marketing, Maths and English skills seem entirely optional.
I recall a Barclay's bank marketing advisor insisting that having two loans at 6% interest was the same as having one at 12%, so their consolidation deal at 8% was better, despite having a worked example shown to them.