I think there is some confusion between a hobby and a side business. They aren't the same thing. For example, someone might make wooden bowls for fun and then sell them at a flea market. That's a hobby. Someone who occasionally makes custom wooden bowls to order and sells them to a customer is doing contract work on a small scale. That isn't a hobby. That's a side business. It doesn't matter if the guy works at a bakery during the day.