Sportsbooks and bookies that offer sports betting outside of these licensing regimes – whether in person or online – are illegal. Federal law makes it a crime to participate in the business of illegal gambling.

All they have to do is look at who is beating closing lines consistently. Even if you aren't green in the short term, they may limit you just for beating these closing lines. In most cases, it is actually completely false that winning too much is what gets you banned. It is beating closing lines that gets you banned.

Sports betting arbitrage (sometimes known as “arbing”) is a way for gamblers to ensure a betting profit regardless of the outcome of a specific event. For example, they may place bets on both a win and a loss, at odds that ensure they make an overall profit across both bets – regardless of the result.