I've never used a pseudonym, but I have always done such activities under my business name, same as when they aren't side gigs.
I don't think of this kind of activity "hustling" or "side gigs", honestly. Calling them those things implies that they are less important or subservient to being an employee, and I've found that's a problematic stance.
I don't think of this kind of activity "hustling" or "side gigs", honestly. Calling them those things implies that they are less important or subservient to being an employee, and I've found that's a problematic stance.