Another communist heard from. "New capitalism", indeed. In truth, though, FWIW, I share the increasing concern about data and privacy. Don't get me started on <strike>evil incarnate</strike> google.
That aside, the salary issue in the NFL is a fascinating one if you're into economics. The cap is an interesting case of collusion by the buyers of labor (team owners) and agreement or at least acceptance by the sellers (players). I wouldn't doubt if a book has been written on this subject.
It would take more than one book to explain the way the money is allocated among positions on the team. The buyers have each independently concluded that an elite QB is worth, what is it, ~20% of all available funds? And a #2 CB is worth ~x% and a punter ~y% and so on through 53 prices.
This structure is a consensus among proven experts on the relative value of each position-- remarkable in itself-- and then applied to individual cases in an imperfectly competitive market and constrained by a byzantine set of rules which requires an experienced expert to understand and resulting in a system which is inflexible and predictable and, thus, stable.