I mean with the force of law, yea. Businesses get away with a little bit more in places because they pay you to show up.
But if you think anyone is going to university/college to have all their devices taken away all the time and pay for the privilege then you might be confused.
If taking away phones is what’s required to make that credential meaningful again, then the universities must do it.
I think of it like a personal trainer. Do you pay them to make you sweaty and sore? Not really, but sweat and soreness are consequences of doing what it takes to build muscle/endurance/etc.
No they don't, or at least a significant percentage of them don't. They pay the university because it is a paywall between them and even getting an interview in the first place.
So its in universities best interest to actually test for competence.
... In theory.