Ive often seen individuals on the left talking about how billionares shouldnt exist etc., but when probed on how that could be accomplished the answer is usually just taxes or guillotines. I dont think either is great.
What if instead, corporations were made to be unable to be sold or owned. Initially theyre made to default to popular election for their board, and after that they can set up a charter or adopt a standard one, ratified by majority vote of their employees.
Bank collapse would probably follow, how could that be remedied? Maybe match the banks invalidated stocks with bonds?
What your describing is a socialist revolution. Marx referred to it as the abolition of private property, which he said is the goal of communism. Private property doesn’t mean your phone or car or home or whatever, that is personal property, it’s stuff you own to use. Private property is something you own to make money from, stocks, bonds, rental properties etc. That type of property is based off power and exploitation, the power to kick someone out of there home if they don’t pay rent, or the exploitation of the working class by extracting there surplus value (profit) which goes to pay a stocks dividends, or to be reinvested in the business thus raising the stocks capital holdings and the stocks value.
In Marxism private property is the justification given to the working class for there exploitation, and abolishing it will free the working class and allow them to organize horizontally like you said with voting, without bourgeoisie property relations.