Just look at the photos. Only a fairly wealthy family could afford to buy him those instruments, and of course, the raw materials for the motors. Even his clothing suggests that there is no lack of money.
Or mowing a few lawns. I pay the teen who mows my small front and back yards $40. It's not a big deal. He's done in 30-40 minutes and moves to the neightbors down the street. This is just a couple weekends of side hustle.