Thanks for this great example of how much metadata can work against the person generating it.
And I also want to thank the author for the wiki regarding the identification of the MUA by the Message-ID, that was a nice new detail I didn't know :)
As explained in "Lawful Masses with Leonard French" [1] it is enough to have marketing material which advertised copyright infringement to be taken down.
Don't know if it is enough to claim you can download Youtube videos to fulfill this point. From my point of view it is thin ice these days to claim anything...
And I also want to thank the author for the wiki regarding the identification of the MUA by the Message-ID, that was a nice new detail I didn't know :)