Because billionaires exist. Literally, that's it. If you do the math and you distribute that out to everyone as their fair labor value, then yeah. People don't need to work much at all to make society function.

Think about how much of your society is just advertising for some new bullshit finance scheme that only syphons money from the bottom up to the top? And they pay people to do it. An insane amount of the "work" done by people today does ABSOLUTELY nothing to benefit humanity. It's busywork to make rich people richer.

Fun fact: our economy is based on the work of John Maynard Keynes, who predicted the high growth would allow us a 15-hour work week by now. Guess where that time is going instead?

It's a fun fact and not a sad fact because we still got the technology anyways, so we can still get there in a matter of years if society makes better choices.