Thats patently false. Some people do control other people, some people do control whole societies. What stoicism does is: for the underclass, it tells them to accept such control. Lying that "you have no control" over working conditions, exploitation, misery, hunger, suffering, etc. Do nothing, because nothing you do will matter.
And for the capitalists upper class what it does is to validate the atroicities they commit: "the universe is an eternal good entity, everything happens for a reason. Sixty thousand children killed in Gaza? Its just the universe changing colors, changing quantity, some people turned from alive to unalive, but in the grand scheme of things it doesnt matter. You are just doing your role".
If you're underclass and beat up on by society above you, stoicism is a very rational philosophy to adopt.
If you're upper crust and controlling everyone beneath you, I think it's still worthwhile to consider stoicism. Or is there some kind of divide - if one is poor you should enact one set of philosophies, if you're rich and powerful one should enact different philosophies?
And for the capitalists upper class what it does is to validate the atroicities they commit: "the universe is an eternal good entity, everything happens for a reason. Sixty thousand children killed in Gaza? Its just the universe changing colors, changing quantity, some people turned from alive to unalive, but in the grand scheme of things it doesnt matter. You are just doing your role".