Well, he's deranged. There's some terrifying repercussions for the US if he manages to win. You shouldn't even be able to suggest someone legally has to buy a product or service
Yes, but America is the country where the companies have more rights than the people and there's a long history of monopoly-preserving legislation.
It's the country where margarine wasn't allowed to be yellow to preserve butter sales. It's the country where food wasn't allowed to be labelled free from genetically modified ingredients to protect monsanto's RoundUp profits (because consumers who knew which was which tended to buy non GM foods).
It's the country where an individual person can't donate more than $3,300 to a candidate in total over two years, and it would be an illegal bribe to give that in return for a policy but Elon Musk can quite legally make his corporate entities donate $45,000,000 every month in return for a policy shift on Tesla cars.
Your "that would give corporations a crazy and dystopian amount of power and control" doesn't cut a lot of mustard in the USA