I agree with you about Cmd-C being more convenient but that’s besides the point.

My point was that on all three operating systems Ctrl-C has an unambiguous feature: send SIGINT. It is more important to have SIGINT be consistent than have copy be consistent. Accidentally sending SIGINT to a job that has been running for an hour? That hour of work may now be gone. This is a deliberate action that should not be a mistake. Copying is not that? Win+C on Windows doesn’t do any destructive actions.