I suspect there's a bit of nuance there which hasn't been identified here yet. Perhaps to do with whether people are background or immediately identifiable, or

I suspect there's a bit of nuance there which hasn't been identified here yet. Perhaps to do with whether people are background or immediately identifiable, or and active part of of what's going on. I know consent forms are a part of television recording when talking to people on the street (otherwise they blur faces), but I don't think they bother to get everyone in the background to sign.