It very silly setting of the MacOs
When you want to remove an executable file to \usr\bin, you will find it impossible, because It is protect by SIP (System integrity Protection). If you want to disable it, you have to go to the safety mode, which is restarting your mac with CMD+R holding. Then, in the safety tool -terminal, you can run a command to disable it.
Actually, you don’t need to do all these. You can just paste your exe file into …\usr\local\bin. It is equally effective as you put it in …\usr\bin.