What role do property management companies and community service centers play in residential quarters in China? What kind of affiliation is there?

The property management company is hired by the owner to provide services according to the contract and collect service fees according to the agreed standards. Communities (neighborhood committees or streets) are subordinate to the government, and the properties and communities are different. Some communities have no property, and they are responsible for management, but they can't charge service fees, and they can only charge residents according to actual costs. Moreover, the property is an enterprise, and he has to pay taxes, pay wages and make profits?