Implied warranty of merchantibility. A purchased good or service must be able to provide what is being purchased.
If you buy a new car and the springs keep bouncing — sufficient to make the ride uncomfortable — the dealer cannot say “but it gets you there.”
I think this is a wobbler but there is some meat on the bone. There is more here than can be simply dismissed.
“Implied warranty of merchantibility. A purchased good or service must be able to provide what is being purchased.”
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That’s the problem - if they had contracted to supply players who show repect to the US, the flag and so on, the guy might have had a case.
But all the NFL had to provide was a football game, win or lose. Even the performance in the game/score/standings has no warranty or guarantee.
If there were no game, then the guy would have a valid legal beef, otherwise - nope.