Easy Opt-out...
At least it's easy to opt out - for a very large number of people, just do nothing... the fact that they are not using an iOS 14.5+ or Android 11+ device, and/or aren't connected to a 4G/5G network will do the trick!
As already pointed out, radio/TV aletts and large outdoor speakers would be far more effective, social media would do the rest. Probably much cheaper and more reliable too.
Biting the hand that feeds IT
