https://github.com/code-423n4/2022-03-biconomy/blob/main/contracts/hyphen/LiquidityPool.sol#L330-L336
There is no limit to the gas fee charged. While it is claimed that there are no incentives for the executors, in reality, executors can be indirectly incentivised by inflating the gas price so that they will be credited a higher fee.
The fee can be as high as the bridged amount - transfer fee, leaving nothing for the user. While there is a lot of trust placed on the executor already, it would help to be able to provide a trust-less solution by enforcing a cap on the gas fee.
Limit the maximum gas fee chargeable.
