Most wealthy people are multi passport stateless and keep their money offshore, paying little or no tax. The bigger the global corporation the more likely they are to be registered in Ireland or other tax free havens. There is no trickle down in taxes when a few have won the Monopoly game

Middlemen still do have benefits. They provide resiliency. If Amazon commits serious fraud and is shut down, there is no one left. We should not have privately owned systems that are too big to fail.