Kuwait and Saudi Arabia aren’t capitalist societies. Certainly Saudi Arabia isn’t. Kuwait I’m not so sure about. I suspect that Kuwait (like Saudi Arabia) allows certain types of business activity and dispenses certain business “freedoms” that the state can easily take away, anytime it wants.
And in both places, what you see as “capitalism” is just huge mountains of oil wealth. Not the same thing. Not by a long shot.
I certainly don’t see Saudis or Kuwaitis sharing the wealth with their imported workforces; what are they?