And what I posted was taken directly from the YouTube Monetization policies! It doesn't matter if it is your own content or someone else's;
if there isn't enough original commentary to tell the channel review team that this is in fact your own work, your review result will be "Reused Content", with the explanation given on your monetization page.
Look; I am a Silver Level Google Product Expert in the area of YouTube, and I answer this very question on the YouTube Support Forum many times a week. I know what I am talking about.
No, adding subtitles won't do anything to tell the channel review teams this is the user's own work. They are looking for some type of personal presence like facecam or voice. The hands in the videos I saw could have belonged to anyone; and this is exactly how the Channel Review Teams think. They don't know
whose content it actually is, and so return a "verdict" of repurposing someone else's content.