I dont think thats an correct interpretation of the EULA, they are just choosing to ignore it - https://wiki.licenseware.io/catalog/rules/apple-macos-lease-...

If a business reserves a Mac for 24 hours (and allows no other users for that window), it complies with the EULA, no?

That doesn't mean the business has to charge the user for 24 hours. You could charge for 6 hours and then just let the Mac sit idle and unused the remaining 18.

You're eatting the cost of that unused time, but if its a differentiator that leads to more business than it might still be worth it.

EDIT: To be clear, imagine a case where the user has 24 hour sole access to the Mac. They could use up 24 hours if they wanted. But usage is tracked per hour, and they're only billed after the fact based on how much time they actually were running something during that 24 hour window.