The command modifies the firewall to allow all incoming traffic on the docker0 network interface (which is created by Docker). It’s basically a bypass.
You can configure Docker to not try and manage it’s own rules, here is some discussion on the topic: https://github.com/moby/moby/issues/22054#issuecomment-2241481323
Incoming based on the code here:
https://github.com/coleblvck/MethodCall/blob/main/app/src/main/java/com/coleblvck/methodcall/services/ScreeningService.kt