I'm a bit ignorant of IBMs business model given how many times they've changed businesses. What you're saying is that IBM has a business that generates revenue, but that business continues to exist (and generate revenue) despite people not actively being at a desk, not that IBM has somehow managed to find a way to make money from empty desks, right?

WeWork makes more money from an oversubscription model, and thus could also make money from desks being unused. (Have 10 desks, rent out "13", and hope that all 13 people don't need desks at the same time).