Didn't say people shouldn't be rewarded for their labor. Hell that's why I got my ISU degree!
But the person/group/entity that provides the capital have right to a businesses profits. Labor can choose if that's the right workplace for them. If not, move to a new employer.
In your example, if a carpenter wants to be a business owner, they are providing the capital to start/grow the business and their labor sustains the business. But the carpenter's initial capital investment bought the tools, truck, store front, etc. to start the business. The owner of the carpentry business decides who their workers are and what they are paid. They earned that right by making the initial capital investment.
With athletes, they have the right to maximize their value. I just feel that should be professional sport development leagues. The collegiate sport model should provide a full ride scholarship (valued at $40k-$60K annually for approximately 1,800 hours of labor) and on the side the athlete can market their NIL (no university involvement).