Greetings, dear user!
Storage of customers' funds is performed on contracts within the system. Customers' funds are under their personal control during the entire course of interaction with the system.
The rules and "honesty" of the system are provided by the structure of smart contracts for storage of funds and the mechanics of markets (the contracts of the markets themselves). Within the system, the customers' funds can be withdrawn back only to their ETH wallet in case of a win or a return of the bet. In the event of a bet loss, the funds are transferred to other players who have won within the given market or liquidity pool.
Thus, the most important part of the system, namely the storage and redistribution of customers' funds, is transparent and inaccessible to circumstances of fraud due to the implementation of a decentralized process.