Because remote classes have higher costs. It's always been that way.

That’s why Khan Academy et al are so expensive, huh?

Khan Academy is not an university.

In my country, universities that offer remote degrees (well before covid) all charges additional fees for it. It’s usually not much (something like 200€ on top of the ~500€ typical fee), but some charge per module so it can add up quickly. A few have a dedicated remote learning center, with is own workers.

A webcam is a higher cost than maintaining a 150 seat lecture theatre?