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That's a common misconception. Sports gambling is exactly like casino games. Odds are skewed in exactly the same fashion in the house's favor, the payout is lower than the win probability. In the long run, the house always wins.
Also, as the industry relies heavily nowadays on trading where any event can alter the odds in real time, I guess the only way to cheat the system would be akin to insider trading.
https://en.wikipedia.org/wiki/Mathematics_of_bookmaking
I think you're misunderstanding my point. You're completely right that the house sets the odds it it's own favour in order to make money, I'm not arguing against that.
My point is that setting odds in casino games like roulette is trivial, and there are no confounding elements that can suddenly make your odds wrong. In sports betting, setting the odds is highly non-trivial and pretty much impossible to do exactly. The better can look at the odds and consider whether they think the house has under-valued a certain game, which is possible, and bet on that. If the better is more well informed than the house, it's actually possible that they make a net win. That's completely different from a casino game, where the odds will never be in your favour.
I would argue that sports betting is a fair game, in the sense that the house sets odds, and you can consider whether those odds are in your favour or the house's favour. Obviously, they will try to always set them in their own favour, but (also obviously) they can make mistakes that are exploitable to a well informed better.