California used to tax the retirement incomes of people who moved out of California after retiring. Can you imagine paying California state income tax if you lived in, say, Florida? The "reasoning" was that the income on which the retirement pension is based was earned in California, so it's only fair that you pay taxes to California on that retirement income after you retired. If IRC, it was challenged in court, and California lost that one.
I'm sure Bustamecha will figure out some other way to tax former Californians. By the time a court finds it unconstitutional, the state will have collected billions of dollars.
You're too late for that. It is already in place.
3.5% sales tax on real estate, but it is refunded to you if you purchase another piece of California real estate.
Call it an 'exit tax'....