It's a black car service, the problem is privacy concerns - the players don't want management to be able to find out how late they were out and where they were.
I suppose having the Player's Association set it up is meant to help the players trust the service. Still, mixing the players in with Uber's capacity – maybe even with customer pseudonyms? – could offer faster service and more anonymity than a previous program.
http://www.thepostgame.com/features/201304/nfl-players-worry...