We communicated with the sponsors to confirm if the protocol plans to accrue referral rewards from LIDO but they replied not at the moment and also went ahead to state that any issues that could affect future implementation (although no immediate plan) could be reported in QA.
The ZapRouterBase contract wont be eligible for referral rewards from Lido when depositing ETH, potentially leading to a significant loss of value for the protocol. Lido has a reward program. 
Read more about the Lidos reward programs using this links below:
In the _depositRawEthIntoLido function of the ZapRouterBase contract, the contract directly calls the submit function on the Lido stETH contract without passing any referral address:
https://github.com/code-423n4/2024-06-badger/blob/9173558ee1ac8a78a7ae0a39b97b50ff0dd9e0f8/ebtc-zap-router/src/ZapRouterBase.sol#L34-L41
The Lido stETH contract allows the caller to pass a referral address when depositing ETH using the submit function. If a valid referral address is provided, the referral account can be eligible for referral rewards. However, in the current implementation, the ZapRouterBase contract is not passing any referral address, effectively making the referral the same as the caller contract itself. This is invalid according to Lidos referral program, and no rewards will be granted to the contract for depositing ETH.
The contract should pass a valid referral address (e.g., the owners address) when calling the submit function:
