Why? As long as it is not competition to your employer, your off time is your time. How would it be different from a hobby? And as mentioned, the intent is not

Why? As long as it is not competition to your employer, your off time is your time. How would it be different from a hobby? And as mentioned, the intent is not to make enough money that you leave your current job. You're still a loyal employee doing an honest full-time job there.