What prevents someone from betting $1 on every NFL team to win the super bowl, at the beginning of the season where the odds are all pretty good?
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The situation you are describing is called arbitrage, which is riskless betting where you make money regardless of the outcomes.
In finance arbitrage opportunities are rare and companies spend considerable resources trying to identify where these opportunities exist and exploiting them to their own gain.
For sports those sorts of team wide bets are valued as a whole, so the company set it such that this sort of event can’t take place. If by some fluke it did happen, people would jump on it and very quickly the bet would be adjusted to remove the risk.
Some people do spread betting, where they take the initial offer of a £10 freebet (which can’t be cashed out) and them using a calculator to bet on a combination of bets to try and improve upon or minimise the loss of the free bet and turn it into winnings that can be withdrawn.
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