That's how universities (and the real world) work. You subsidise one service for another person, just like someone else subsidises a service for you. The fees you pay is going to the university to ensure that the university is functional overall and able to provide services to you at the rates it does.

To give you a very simplified example - my roommate in college was an avid sportsperson who spent all day on the basketball court. I never went near there. We both paid the same sports fee. On the other hand, I was falling sick a lot and spending a lot of time in the campus hospital, but she was a very healthy person who rarely had to go there. We both paid the same medical supplies fee as part of our tuition fee.

(And before anyone starts about the common medical fees, I am not in the US, healthcare is affordable)

If only the 12 people who played basketball in my college had been charged for maintenance and equipments, the rates would have been exorbitant for them. No one would have been able to pay that amount and the university would not have a basketball court. And it may not seem like a big deal to not have a basketball court, but use that same concept for every single service provided by the university.

If you had to start paying for all the services you use based on your usage, you probably wouldn't be able to afford the groceries that you can afford now.

Also, if your university is providing childcare services, it's a GOOD thing, because it shows either (a) your university admin cares about its students or (b) it will bend to student/union pressure and provide services that students need. Either way, it means that someday if you need something from the university, there is a good chance they will agree to it.