It is true in the sense that there is a legal concept called "duty of loyalty" https://en.wikipedia.org/wiki/Duty_of_loyalty https://en.wikipedia.org/wiki/Duty

It is true in the sense that there is a legal concept called "duty of loyalty" https://en.wikipedia.org/wiki/Duty_of_loyalty https://en.wikipedia.org/wiki/Duty_of_loyalty It should be pretty obvious you can't compete with your employer. If you want to compete then quit. You can't steal their trade secrets even if it's off duty. There's lots of other things covered by the duty of loyalty concept and if you explore them they almost all make perfect sense. It easy to see how the world wouldn't function without it.