If you don't buy support for software, you're the support team.

Maybe that's something a savvy teacher is willing to take on for a small, advanced class where the students largely know what they're doing, or at least have a reasonable baseline of prior education.

It certainly doesn't scale when we're talking school wide software, tiny IT teams and dozens of thousands of students & and hundreds of faculty of varying levels of computer literacy all bringing their own devices.

I guess it depends on if you have a strong enough IT team to provide that support or not. I doubt many schools, or even large corporations do.