Schools and colleges like to present themselves as intellectual moral exemplars, wheras a Theater just wants to make $$$ for their owners. This is even moreso in Europe where governements do have far bigger stakes in funding higher education than the US and, especially the UK and the Nordic block moreso again, the government likes to be seen as being a leader in equal oppertunities and diversity.
If someone tried this in a private theater odds are they'd go bust and people would bring their buisness to another provider. Education on the other hand has a hostage audience for the most part. If Manchester is the only viable place you can study Preforming Arts because money and being accepted are big considerations, you're pretty much stuck with them.
It doesn't help that most educationalists have lived in a bubble and rarely ever had to face reality, so their perception of it is often skewed.
TL;DR: Private companies just do what makes money, and shilling for autists doesn't always do that (but when it does, they will). Universities/Colleges have their funding more or less guranteed and can follow whatever hair brained scheme strikes their fancy.
Though not always, there have been a very few select cases where places like Chicago and Yale have had to clamp down on SJW's, because it was driving away big investors. That's really a rare exception though. Others like Oxford in the UK have been ruled by a miniture Black Lives Matter group for the best part of five years now with chief objectives such as removing all dedications and monuments to historical figures from the days of the Empire.
