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It would cost some money but one could quite easily create wifi jamming detection for a whole city.

It's simply staying ahead.

It's far easier for people to get proper cameras that aren't relying on wifi or internet to function.

Even so you still need police to care for this to be if any use

That will only benefit those who can aford it.

If theves are going to broadcast their crimes in advance it's stupid to chose not to receave the announcement.