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My read is that it's immoral because it's a surveillance hijack without the knowledge of the users, as opposed to an opt-in.

And its not just opt in for the camera owner/licensor it should be explicitly optin for anyone who gets recorded

In the US, you don't have an expectation of privacy in public places.

I'm in the US. I have an expectation of privacy in public places.

I suppose you can expect whatever you want, but the law is not on your side.