I don't care what the carrier agreement says. If they want to send me the warnings, fine. My phone is perfectly equipped to receive them and will happily display them should I choose to allow it. What's unacceptable to me is forcing my phone to do anything. It doesn't matter to me if there's some piece of paper saying I can't turn them off, I will turn them off and I will resist them if they try to force it on.
I mean, you can try. At some point they may just kick you off the network. No shoes, no shirt, no service. IOW, providers have a right to tell you how and in which fashion you use the service. Just like you can’t walk into a 7/11 butt naked, you apparently can’t go into Germany without enrolling in emergency alerts that probably go off once every decade (not including tests).