@HeavenlyPossum Basically, a cartel turning into a rentier class is the usual outcome.
Capitalism eats itself and out come the rentiers and everyone else (including other less powerful capitalists) is fucked.
Which isn't even remotely new, that's literally what the word "antitrust" comes from. Busting the trusts a few local oligopoly/cartel rail operators had built to screw everyone else over.