建議你睇下terms先玩

Round-tripping transfers will not be taken into consideration in the calculation of the eligible transfer threshold.
Transfers from a recipient back to the sender will not be taken into consideration in meeting the required transfer threshold. (i.e. User A sends USD 10 to User B. User B later sends USD 10 back to User A. The USD 10, in this case, will not be taken into consideration as an eligible transfer.)