There is no MEV like on ETH. And it’s not federated. The main purpose of drivechain is make sidechains trust-less rather federated. Miners are profit seeking as subsidies drop after each halving cycle miners become reliant on transaction fees they will benefit from blind merge mining sidechains. Censoring transactions is bad for mining business so there is no incentive to censor.
Merge mining already exists on federated side chains like Rootstock (no down time in 6 years)