Why do some companies recruit through outsourcing companies instead of directly recruiting themselves?

People recruited through outsourcing belong to labor dispatch personnel, do not sign labor contracts with employers, and their welfare benefits are generally lower than those of employees of employers; At the same time, according to the current understanding, the compensation for work-related injuries of labor dispatch personnel has nothing to do with employers, and outsourcing to employers can greatly reduce labor costs and pass on risks.

Please adopt it.