My first instinct was to decry this as a reactionary move.

But anyone that has been a teenager knows that a significant portion of teenagers are absolute sociopathic assholes. That's how it is, and how it's been for a long time. And while I wouldn't blame the teenagers for this, we should not pretend otherwise.

Limiting the way they can project this onto each other seems like a reasonable thing to do for the sake of mental and physical health.

Although I don't think banning the devices would work at all, that's way too easy to circumvent.