I wasn't aware that unlisted videos could even receive copyright/bullying strikes, but it seems obvious now.
You could easily ruin someone's YouTube channel by finding unlisted videos through the rest of the Web and reporting them, like this poor couple have found out....
yeah, I've had unlisted/private videos that are a couple years old (with the links shared with no one) get retroactive age-restriction flags or copyright flagging. I'd have to assume YT updates their algo and retroactively skims over some older back-catalog videos.
You could easily ruin someone's YouTube channel by finding unlisted videos through the rest of the Web and reporting them, like this poor couple have found out....