But is it not a private organisation?

I don't see a way to not quickly devolve into socialism with that line of thought? You have to reject the notion that people should be allowed to spend their money as they see fit.

If you want to convince people that their money would be better spent elsewhere, fine. But to demand they should not be allowed to spend it on a Yale education is authoritarian and socialist.

It's not a private organization, it's a charity. In exchange for not paying taxes, they've given up the right to spend the money as they see fit.

I was talking about the people giving them money, for example by paying them for their education.

If the discussion is about removing charity status from Yale, it would be a different thing. As I see it, Yale is offering a service and people voluntarily decide to pay for it, so removing that option would be authoritarian.