It's only murder if you can't afford to defend yourself in court ... or if you can literally buy off the police ... or the judge ... or the entire court system ... or the state ... or even buy the entire country's government
I believe the standard theory is at a certain threshold success is measured by those you have stepped on to climb higher. I'm not sure there's a set benchmark worth but I can guarantee you by the time you hit a billion you have for sure negatively impacted someone's life to get where you are.
Excess wealth needs to be banned but for it to truly work the majority of people need to see it and sadly we live in a world where too many people see themselves as embarrassed billionaires simply waiting for their opportunity.
I make damn good money. I have more in common with the man begging on the corner than I do with Elon Musk, Bill Gates, Warren Buffet, et al. More people need to come to terms with that reality.
$100,000,000 that's it. At that point we give you a gold "I won capitalism," trophy, and you either retire, and are taxed at 100% of assets above $100,000,000 or, you don't and are taxed at 100% on assets above $100,000,000. This applies to both liquid and non-liquid assets.
Also you can leave your children $5,000,000 in total assets per child over your entire lifetime. The rest of your estate goes into The Sovereign Fund for Humanity's Poor.