The relayers running Meter Passport are: Protofire, Hashquark, InfinityStones, Wetez, and Meter. 3 out of the 5 relayers were previously running the original Avalanche-Ethereum bridge, which was also based on Chainbridge and had more than $300M TVL with no security incidents. They are also running validator nodes on various other networks including Binance Smart Chain, Polkadot, Polygon, Avalanche, Meter, and Fantom.