XM - What's now?
Leverage 1:888 does not apply to client registered under the EU regulated entity of the Group. The maximum leverage for Trading Point of Financial Instruments is 30:1.
No, you do not need to refund any bonuses received by XM.
All the bonuses are provided to help traders open larger positions.
If you have lost the bonus, you may find another one since XM offers variety of bonuses.