Since the article doesnt make it clear
This is for new or re-activating customers in a congested area.
This isnt a random usage fee, this is for areas they claim are too busy, so you gotta pay if you want to gain access.
Its like when you call a contractor and they quote you a stupid high number. Its often because they're too busy, but if you'll pay the stupid high number theyll do it.
There was no world where SpaceX could support unlimited customers in a cell region.