Because there are people working to smuggle Thai Australia without taxation it illegally, there are serious and many Thai workers, when it comes to compete for them. Because of cheaper labor, Thai people to hire Aussie work.
Thailand because there are people working illegally in Australia by taxpayers. It is illegal to serious Thailand has a lot of labor and when it's like to be a threat to them. Thailand because labor was cheaper to hire someone to run the Aussie.
Because there are people smuggling work in Australia without tax. It is illegal to serious. And when the Thai workers have many it seems to steal them. Because labor Thai cheaper to employ Aussie work.