Registering as a business in a state though is usually an activity that takes 15 minutes and around $100. If you are doing enough to have a few employees, paying an accountant type to do this for you is very cheap and quite easy.
Imagine the opposite: you set up your business out of state and employ California residents but don't follow any of their labor laws. You underpay them. You don't take out the appropriate amount of state taxes. You don't report their income to the state. You don't give them overtime pay. How is this not just a glaring problem?
Even a minimum wage employee working full time will cost that much in a week or two.
I feel for people who are on the lower end of the income scale that that try to do basically anything is California's hostile business climate.