It's worth pointing out this is specifically not mass tracking. LFR scans faces against an existing database of outstanding wanted suspects. If a match is made, it alerts the officers who are manning the camera there and then. It doesn't store anything that wasn't a match.
replyTo continue GP’s point, in Moscow a “database of outstanding wanted suspects” was enough to get a well-known science writer[1] who publicly expressed her opposition to the war systematically harrassed by the police because she (a then-pregnant woman) matched a database record for, I kid you not, a draft evader. Reportedly some of the officers even admitted the absurdity[2] of the situation but, well, computer says detain.
reply[1] Asya Kazantseva
[2] Women can be subject to the draft if they’re doctors, radio engineers, or one of a handful of other professions, but thus far it’s very uncommon and either way not applicable in her case.