Dude how do you expect any editor to pick up plaigarism? In academia you have software to scan and pick stuff up, and then only some instances are picked up. But in media, if no one else stumbles upon the obscure YT channel that has been ripped off, there is no way for anyone to pick it up. Even in mainstream journalism out and out fabrications were picked up years later when someone spent time investigating. This sort of thing is next to impossible to detect.