i can't avoid public cameras.

should i run around with a full-face mask? (illegal in austria).

refuse to go outside? (not healty, and hardly possible for most without risking your job)

move to the countryside? (away from the crowd?)

seriously? what can the average person do against all this privacy invasion except for burying their head in the sand?

the only viable action is education. as you say, talk about the problem, spread awareness, until the majority of the population is better informed. and even that looks futile (though i believe it isn't) everything else is hopeless.