Strange logic. Would you consider it unethical for former Google employees to start their own search engine? Or to quit and go work for Bing? Assuming they aren

Strange logic. Would you consider it unethical for former Google employees to start their own search engine? Or to quit and go work for Bing? Assuming they aren't stealing code this happens in every industry. Can former Ford employees not work for Chevy? I don't see the difference.