This is a decent post, but I object to the framing of "Marxism" as some kind of extreme political ideology. It's just a view of economics, not radically different from other strains of economics. Being a "Marxist" doesn't mean you're a steely eyed revolutionary. I'd guess that all the richest people we can think of are Marxists in the sense that they believe in a materialist class analysis, and that their class interests (those of capitalists) are opposed to the class interests of, at minimum, their own employees.
How do we know this? Because capitalists demonstrably and objectively behave as though they have class solidarity. Yes, they compete in the market and even through political corruption, but they are very organized and committed to basic principles that benefit all capitalists: anti-labor policies, weak anti-corruption laws and enforcement, tax breaks and loopholes, etc. They have lots of money, so they obviously support policies that make it easier to transmute money into power over others. This is not ideological, but a matter of material class interests. Musk's "makers vs takers" framing is Marxism, but from the point of view of a capitalist.
Likewise, it's totally possible to be a middle-class anti-labor Marxist. Marxism is only a lens to look at things through, and what it ultimately says is about the class position of whoever is looking through it. It's about identifying what one's interests are, not necessarily a prescription of what to do about it.