Nice feature providing transparency, but why not additionally set the default to deactivated? What's the problem here?
The problem might be that Apple knows this feature doesn't and can't use masses of cellular data, and people are just freaking out over an imaginary panic, as they sometimes will do. Hence providing information to calm nerves without giving in to misinformation and turning it off (and probably nobody would ever turn it back on).
Only a theory. Time will tell.