I will also point out a simple fact. Validators on dYdX truly do it for the Love of the Game. A top validator like Polkachu makes ~$400 per month, probably/almost certainly operating at a loss. Enabling the weth-ETH bridge will require them to run additional Ethereum-node which can cost $1-3k per month for compute, storage, and network egress. Over 12 month period, that would mean tens of thousands of dollars in additional costs that is not compensated due to the low rewards paid to stakers. Many validators simply voted along economic principle.