Any cliffs on why you assume its a scam?
Many times, they will offer only one side of a bet. They also offer odds that aren't "real". They are completely inflated. Take for example the tennis match above where they offered -1667 on the favorite and +250 on the underdog. Bet365 was offering +300 / -475 on the same match. Directbet uses the same odds provider as Bet365. But, they are able to adjust the odds based on the amount of money they have on each bet in order to ensure a profit. As mentioned above, many times they will even stop offering one side of a match and pigeon hole bettors into betting on the side that is advantageous for DirectBet. No, us bettors don't have to take that selection, but a lot of people do...it's the gambler's nature.
DirectBet is an unlicensed shop, which is why they can get away with this.