Essentially the same as using Optimism’s official bridge which let’s you bridge any Ethereum ERC20 token OP Mainnet Gateway
https://bridge.justice.exchange/ - it does NOT hold JUSTICE-and is NOT a custom bridge. Just Optimisms but built into an AssangeDAO style page.
Useful for building apps on Optimism that use the JUSTICE token. (see https://place.justice.exchange for an example use case.)
Edit: added link to an example usecase that I built (Place)