I didn't say it was a black and white issue. I said it was an ethical issue, and like all ethical issues, there is a very wide spectrum of what fits, what doesn't, and what's grey area.
I can think of reasons why one might record a stranger in public, or a stranger might end up in a recording, but I thought it was pretty clear from the article that we're not talking about that—we're talking about content creators (any person making content) filming strangers without consent so they can create content using those strangers. These other things you're talking about are irrelevant to that conversation.