Maybe I'm naive but I don't see how that's impossible. Does there not exist an integer number below 7 billion which represents the number of people required to manually validate each of the claims? Or is this number so high that Youtube's $20+ billion revenue could not pay for those people? Unfortunately Google doesn't reveal net profit but it's well known that Youtube has been profitable for years and it's hard to imagine it being less than 10% of revenue. If it really is that extreme it sounds like more of an issue with Youtube's systems.