I went to China in 2019, and they scanned my iris... yeah...
At an airport, there was a sign that said "Stand in front of the camera and we'll tell you the way to your gate.". It scanned my face, and on the screen it showed me my name (I guess to make sure it's the correct person), my gate, and how to walk there. I never consented to this commercial use...
That's almost certainly available in a public database in China, FYI. I got to speak at a cool event in Shenzhen in 2019 and the gates automatically face (and maybe iris?) recognized for entry -- I never 'got scanned' consciously, but they worked great first try.
As far as I know, face-recognition tech is illegal in law-abiding countries.
Although it's probably mostly a legal impediment, I can imagine if the authorities spotted an event and need to track a suspect, they can put all the footage into a system and it will return a sequence of videos/angles in which the suspect was seen.
At an airport, there was a sign that said "Stand in front of the camera and we'll tell you the way to your gate.". It scanned my face, and on the screen it showed me my name (I guess to make sure it's the correct person), my gate, and how to walk there. I never consented to this commercial use...