If you would have kept reading, you would have noticed that employees can apply for an exception to the policy.

So if, for example, you are a UX dev and need to test your CSS on Edge, they have a process that allows you to do that.

And it's not "just a bit of money", Microsoft's enterprise product licensing is truly onerous. It's almost a career unto itself just to make sense of it, and it requires a non-trivial amount of infrastructure to support.