I really do think the CUB/LEO Dev team should focus on a bridge or other revenue generating services that can burn CUB/LEO. Like the MATIC bridge you are suggesting. The kingdoms are great, as they provide sustainable fee revenue too, but some customers of the kingdoms might harvest and sell putting downward price pressure on CUB, whereas the MATIC/ETH bridge doesn't put any downward pressure on CUB, with the added benefit of volumes in the WLEO and bLEO (and maybe mLEO?) liquidity pools.