Obviously, there is a limit as to how much money a single individual can have - It doesn't need to be written into law. Wealthy individuals are a flaw of capitalism and the system will always keep trying to get rid of them.
If someone has too much money, working people will stop trying to produce goods and services for each other; instead, they'll focus all their attention and energy on trying to extract money from the rich person.
That's kind of what happened with the tech industry in the past few years; nobody is really trying to provide value to regular people (that's just a pretext); instead, everyone is trying to extract value from rich investors; that's where the money is.
If you want to make money, why bother go after regular people who don't have much? Our whole economy today is built around fooling rich people out of their capital.
Which is easier; 1. To convince 100K working class people to give you $10 each in exchange for 100K units of goods/services or 2. To convince 1 wealthy person to give you $1 million in exchange for a 4-slide pitch deck and a speech that you put together the night before.