One of my friend’s coworkers did this but I didn’t know the coworker well enough to see how it turned out. I have always been curious.
The logical conclusion is maximize your earning moonlighting an additional job. It's hard though; to land one, and work two jobs concurrently. IF they're both remote helps a lot.
In places like CA, you'd probably be fine to offer services to a company that's completely unrelated to your nominal employer, as long as you don't use privileged information from your "main" job.
That being said, have a friendly chat with your own lawyer before doing this.