they like to work hard,very bad crime.

You are missing the point. No-one is disputing their work ethic, It is their intentions and lack of loyalty to their employer who is providing their flat and work visa. They send the money home from their first job to their family. Then they use their chinese/western bf or husband and their income from their second job to live a lifestyle of drinking and shopping.

So they plead poverty, but actually in most cases they are better off than the western FT who plays it straight down the line.