Thanks for all replies!

According to the replies, I think maybe my work makes me more sensitive to these things than others:
My job "records" people in public place oftenly (voices or movments, most time not the main purpose, but it will), so before we start working we usaully try notice people in the area, if they don't like to been "record", they can wait or leave for a while. After that, we also do some protection works like pixelated faces or mute/cut dialogues.
We all know they can't sue us(if we do our job quiet and quick, they won't even know..), but we don't want anyone feel uncomfortable.

I just could't turn around my thinking immediately few hours ago, thought people should or will cares about their digital footprints like real one lol
Or maybe this is JUST a game and I'm too serious...

Anyway, thanks for all replies again, have a nice day!