It is a nice side hustle using the sign up bonuses. Matched betting is a risk free way to extract about 95% of the bonus value. It's been a good hustle here in Australia. Done right you can net at least $40k. But that said we have had online sports betting for a long time (but not online casino gambling). Aussies bet $20 billion in annual turnover just on racing and sports vs just $4 billion in the USA. Population 25 million vs 330 million gives you an idea how popular having a punt is here. Those bonuses are a nice side hustle while it lasts, but the bookies will eventually either close your account or limit you wager size. Betfair are horrible, they used to be good but their greedy premium charge for those who win consistently killed it as a fair betting exchange. Their name is the epitome of irony. Betfair have the most obscene house edge, they take up to 40% of your win whilst you wear all the loss. It's actually even higher than 40% they way they manipulate the calculations.