See also college athletes. A lineman at a top-tier football school in the U.S. ends up with all sorts of chronic injuries, possibly including brain damage. Very few of them make it to the pros. None are supposed to be paid at all except in kind for degrees, room, and board.
This is exactly why I think those football programs should be professionalized. The program should be licensed by the school - logos and all - but completely financially independent. Obviously, the money says otherwise ( football donors are a very significant stream of income ). And you'd quickly develop a "New York Yankees' problem - wealthy programs would have more money.
I have a Son In Law Candidate who is physically arranged like a left offensive tackle. Even in high school, the six hour practices put him off it.
Part of me says that "the love of the game" should be encouraged, but as you note... the costs are substantial. And I think the real money in sports is trading on the player's name, anyway.
I am sure it's a cause of pain for people but somehow, game dev. work being that way seems inevitable. My own exposure to the antediluvian music business ( back in them '80s ) was that it was The Island of the Lost Boys from "Pinocchio".