In most part of 2021 and probably in most cities in the US, calling an ambulance could not get you the help. The ambulance operators would ask you for a hospital acceptance first before dispatching an ambulance to pick up the patience. Hospitals in wealthy nations like the US, France, Italy, UK, Germany were overwhelmed with critical Covid patients. Some hospital staff that I know personally even admitted their hospitals put bodies on the hallways covered with just white blankets because storages were full and body bags were out.
How do you expect a high-density population like China to respond to a Covid tsunami?