shulio,
Directbet is a clone of Betfair markets with odds some ticks lower than Betfair (probably an edge).
There is no badmington at Betfair, so no badmington at DirectBet.
How you can claim directbet as clone of betfair nothing looks similar in them. Directbet is not providing badminton game may be because there is not much margin for sportsbook in that event or their are some other technical problems in adding it.
It's quite obvious they are a betfair clone, they take betfair's prices and take a percentage off them to build a margin. In horse racing (where price movements happen a lot) it directly correlates. All the markets are the same, they even use the same market id as betfair for every sport. It would be so easy to manipulate there prices in illiquid markets on betfair if you wanted to risk (although I wouldn't advise it).