What is a betting broker?
A broker is the middleman between you and the bookmakers you would rather be betting with. You open one account with it, fund it, and place bets at Asian bookmakers and betting exchanges through the broker's own platform; the broker holds the balance, keeps the records and settles with each operator on your behalf.
The bookmakers most of us start with are built to take small bets from customers who lose. Win steadily and the stake shrinks, then the account closes. Asian bookmakers and exchanges are built the other way round (Pinnacle and Betfair are the names to know). They live on volume and thin margins, so they take far bigger bets, and a broker is how you get an account there. Not a loophole. Just a different door.
The word agent has a second meaning, a salesperson who signs up customers for an operator, and that is a different job from the one described here, done for operators rather than for bettors, and not one this site covers.
The diagram shows the shape of it: one account on one side, a spread of operators on the other.

