[Shendare]

But how literal to the definition do you go before you cease to be reasonably practical? "Unlimited" is an abstract absolute concept. Nothing in existence can ever be unlimited, looking out to, say, the heat death of the universe.

In the end, it's a marketing term meaning "we don't arbitrarily set a numeric limit like 50GB", not that it can never possibly under any circumstances run into any kind of physical or practical limit.