One thing that can happen if we just let capitalism run freely is that a very small set of companies own pretty much everything, they may own your land and your air and your water.
It really seems like this is happening actually. Only a few companies own most other big companies these days, which gives them tremendous power.
And then you have people like Klaus Schwab who says that in the future you will own nothing and you will be happy. Of course, what he does not tell you is that if you own nothing, you
also cannot complain if you get even a little unhappy, because you have no power. So you are basically a slave if the powerful (therefore corrupted) people who own you want you to be.
To spell it out, those who own nothing will almost immediately be seen as little more than farm animals and treated as such because that's what people with power do. Is that happiness?