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When I was in university IT ~2008 our main concern was people accidentally serving their own DCHP onto the network and colliding with ours, generally by plugging in a router LAN port out. I could imagine a decree with this goal saying "no personal devices" to keep it simple.

> How many students are just rolling over and saying sorry?

Probably most/all. IT infrastructure is critical and there's a very good chance that the IT staff have a process in place for dealing with kids who won't let them do their jobs. And it's probably a pretty effective process that has been refined over the past decades.

Replying all gets you booted off the school network for a certain amount of time, it's in the TOS so they can do it. I imagine people value network access over having their own printer.