Nothing to worry about too much. These chinese girls need the money so badly and so they let them do it without thinking about it ...
But these people post the videos here in a long hair forum, but all what they do is to shear womens head free from long hair and making money with the cut hair and the videos. I don't think that we should support them in doing this.
They should use haircutting forums for this kind of stuff. These videos are not what long hair fans would expect here.