Earlier quoted context omitted.
>captured from the non-rich. What do you mean by this? The economy is not zero sum, it is possible for everyone to get "wealthier", even if the spread increases.
This is a good point, but a lot of ressources have a fixed or limited supply (arguably all of them); if wealth inequality increases, the poor fraction of the population will have a harder time competing for those. Consider urban housing as an example (specifically price development in terms of median income, and how the supply side reacts to wealth distribution by "overdelivering" luxury appartments from the average…
RE Valve: using revenue per employee isn’t a meaningful way to tie this to inequality. High revenue/employee in a software distribution business just reflects scale. Developers use Valve because it gives them access to a big market, not because Valve is “extracting” in some zero-sum way. If Valve disappeared tomorrow, the distribution market would become less efficient, not more equal, and consumers or developers wouldn’t actually be better off.