alt Hacker NewsThere could easily be. There's no reason you couldn't publish some Elo-like thing on teams or players, if that was your interest - you don't need gambling to get a good idea of who the favorite is. But the interest is in gambling, so most people inclined to publish such a thing probably bet themselves/sell it as a product to gamblers.
But this is where stuff like prediction markets shine. In chess, for instance, the prediction market odds are going to be way closer to the outcome than might be expected because of the players' ratings. This is because skilled bettors are capable of considering things like exact matchups, history, short-term performance/form, and many other factors that a static rating can't really account for.
Incidentally this is also what makes chess games relatively profitable. Moderate-info bettors will do things like flip on their chess engine, look at the eval, and then bet on that. But a computer might say a position is a dead-draw when a stronger player can tell you 'white has big practical winning chances'.