Wealth concentration happens when the long term return on capital exceeds the growth rate of the economy according to Thomas Piketty.

The wealth obviously concentrates with those, that have the most assets and least amount of spending in relation to their total income.

When you think about this, this system is inherently injust if r<g is true, which is the reason why politicians and economists are addicted to growth. Capital must dictate the growth rate of the economy instead of people dictating the growth rate that they want.

Now, under this perspective you have found the secret cheat code on how to get richer automatically. There obvious problems for every day people. Exponential growth is really slow in the beginning so most people never get to the point where their money is growing as much as a get rich quick scheme would promise every single year.

The other problem is that they are human beings that need food and shelter which means living expenses are a big portion of their income meaning they don't have much to invest in the first place. It would be better if you didn't have to pay capital gains to the rich.

However, if you are going for that living off other people's work strategy, you should be aware that the road is long and the rewards are only reaped at the end. Oh, and everyone will hate you.