While I don’t think intentionally surfacing these videos is wrong in any legal sense of course, I think it’s wrong ethically.
Exploiting someone’s mistake in this manner is not noble.
It’s the same reason we (good folk) look away when someone’s clothing accidentally reveals more than they intended, though it would be within our right to look.
I choose not to view these because I don’t believe it was intended that I should, and without the consent of the creator I chose to err on the side of decency.
people didn't change, our perception of the internet changed (for better and worse). I still see enough people posting intimate stuff way past my boundaries that I think this is simply how some people are wired. I'd definitely wager that 90% of the people who I'd notify of this in some sort of census would not bother to delete/unlist these videos.