I don't know what you mean, but there is no such thing as infinite money, perhaps what you meant is passive income, yeah but you have to understand that people that are millionaire doe have a lot of source of income. So it could be stocks, crypto or even gold or oil investment.
As for displaying such wealth, there are still two set of investors: those who want to flaunt their wealth by buying a lot of expensive cars, and then on the other hand, people that wanted to have a low key life and be frugal and yet they have a deep pocket and a lot of investments.
This term as (endless money) not everyone uses and not everyone knows how to use it, you don’t have to be a millionaire to receive money endlessly, you just have to set yourself a life bar where there will be no Bentley, luxury villas and yachts for a million dollars and then you will be able to earn, invest and receive passive income, for example, $5,000 every month, and you will receive them endlessly if you don’t do everything right and don’t spend money where it’s not necessary, invest them correctly (preferably in real estate) and even investing in real estate has many pitfalls, but I think I conveyed the essence to you, yes, this is achievable only through investments, but the main thing is that you can have, for example, $5,000 every month endlessly, that’s why I called it Endless Money.