They don't, and as a result most don't get much if any.

For them to survive, they have to have got returns from somewhere - maybe welfare, inheritance, a day job. Someone has to have worried about the returns so they can be free from thinking about it.

And if you don't worry about returns, you will let someone extract it ruthlessly from you, that you contribute millions of value to a company that gives you nothing back. This may be fine to you at some level, but many of the people who you allow to exploit you use the resources they gain as leverage to further their selfish ends, like a certain richest man in the world who helped a certain politician buy an election at the most powerful country in the world.