California exports a ton of lower income people, and imports about the same number of higher income people. Check out the heat map here:

https://lao.ca.gov/LAOEconTax/Article/Detail/265

The NIMBYs are almost exclusively wealthy homeowners. Not 100% but close to 99%. But in California, the wealthiest homeowners also co-opt the language of the displaced, and take on the mantle of those who can no longer afford rent, even as their actions of exclusion increase their home values and rents in general.