[nubg]

Explain how the plastering of streets with cameras can be done in a privacy-preserving way?

[andrepd]

Well it could. Laws that simply ban any public-facing camera from doing anything except write to encrypted storage, which can only be opened with a court warrant.

I know laws are boring and tech is exciting, but sometimes there's no technological solution to a societal problem. Good old laws, police, fines, prison, is all you need.