re: If you were a football player, why would you not get Covid now on purpose?

The study you linked was based off passengers from the Diamond Princess cruise line, average age: 65.

But if true, then the players should be living in bubbles quarantined from the outside world for the next couple years until a vaccine is found (if it ever is).

Playing football is no more of a risky proposition than going to the store, a bar, a protest, a political rally, class, etc.

Of course none of them are isolating, so talk of football being dangerous is groundless.