I'm a bit confused by this statement. In the vast majority of cases where an individual purchases something, they do it because they want it (food is purchased because the body desires food, phones are purchased because the brain likes communication and connectedness, medical care is purchased because people realize it helps them, etc). Therefore, for someone to have accumulated a large amount of profit, enough people must have decided that whatever they are offering is beneficial.
Simply put, if a person has a large amount of money earned through a truly free market, then they must have provided a benefit to society.
Now, this can be confused by things like regulation. Regulatory capture, corruption, and many other things can all force people to purchase things they do not desire or do not provide as much benefit as a different product, but this is not an issue that can be solved by more regulation or taxation. Instead, it is an issue with interference in the market which causes the inequalities that I would agree, very much do exist.