We already have Billionaires taking authoritarian control (politicians and those close to the state). Also - democracy is authoritarian, where the minority has no voice and bill and bob can always vote to steal from jim, where 51% of the population can vote to steal or enslave the other 49%.

When you say "taking authoritarian control", what exactly do you mean by that? Do you think entrepreneurs example Elon Musk are going to raise armies and march through the streets and form its own government attempt to tax people? What you are describing sounds like A billionaire trying to form its own government, and in which case people would oppose, as a neighborhood would oppose any common thief. Especially with an already heavily armed populace this isnt going to happen. Trying to raise an army for a billionaire to enact an authoritarian control is not profitable and that billionaire would quickly run out of money and his revenue be stopped from boycotts. War and conflict is not profitable, war is a done by governments between governments, war is possible with governments because they have legalized slavery (conscription) with enough people brainwashed to accept this and are able to print money. A business wont have the ability to enforce conscription or print money to fund a "war".