I just checked my 1 video that used to make me money fairly regularly and I see that I'm no longer making anything because I used a snipped of music from a copyright artist. My bad, but now the artist who's 5 seconds of music is in the video is making the money instead of me. I seem to remember getting an email about that some time ago.
Another potential pitfall one needs to watch out for. Unfortunately I don't have the raw footage anymore to remake the video and repost it, but whatever, it's not worth my time