It's simple: a rich person becomes rich because he or she has something others want. Oprah Winfrey and Leonardo di Caprio provide entertainment, Elon Musk provides rocketry, and Bezos delivers Chinese products at home.
On the other hand Socialists, Fascists, Communists build systems with centralized controls which stifle ingenuity and abuse human rights. It should be noted that many neomarxists who call themselves "socialists" are closer to fascism, because they only seek partial government ownership of the means of production, use government regulation and industrial policy to direct a command economy.
China is an example of an evolving fascist regime, which combines some Marxist ideology with a capitalist system with clear fascist characteristics.