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You're right. There's nothing stopping people (Elon Musk's brother, for example) from creating what can be very profitable. But given all the favorable tax treatment given to incumbent businesses a forward looking Fed, State, or City government should want to create a favorable climate to grow these businesses. (intended).

Can't comment on USA policies because I'm Canadian eh! While large scale operations might require support I reported a person who created a microgreen operation for $1000 here.