Firstly: Is the system actually "stacked against you" or does it provide better quality of life for everybody? Yes, there are people with disproportionately more, but even the people at the bottom are better off under this system than many others, including communism.
Secondly: are people at the bottom, whose skills include things like "putting stuff on shelves" and "asking if you want fries with that" actually building a career? No.
Thirdly: those people all have the freedom to start their own companies. Unfortunately, what people will find is that it's a lot of work and a lot of risk. So they don't. And then complain about inequity.
Lots of complaining, very little effort into actually improving their own lives.
This isn't to say our system is perfect, cause it ain't. But by and large people aren't complaining because their life sucks, they're complaining because someone has more than them.