I think we are discussing different magnitudes of Ubi. I would consider leaving a 200k job for 40k Ubi (which I think is a number more in line with what people describe.
First off, my 200k salary would be taxed into effectively a 100k salary.
I could live pretty well off 40k if I never had to work, so quitting my job would be a quality of life upgrade.
I think a lot of my peers would consider the same.