A back-of-the-envelope calculation says that it would cost significantly less than the annual budget of the (London UK) Metropolitan police to put every window in London under laser-microphone surveillance.

Likewise, I assume that every sufficiently important person is targeted with some form of surveillance by at least one organised criminal gang interested in either taking their money or corruption, both of which can be achieved by surveillance-enabled blackmail. “Sufficiently” is variable depending on much this tech costs, and it’s constantly getting cheaper.