They should be running those automatic submarine swaps in Liquid.

Their model doesn’t work on L1 with high fees.
How?
  • Muun hosts the Lightning Wallet but it credits you on Liquid on every transfer ( automatic submarine swaps ) minus fees ofc.
  • No need to do peg-ins-outs on every transaction. They just need to have a mirrored amount of liquidity on each network and rebalance occasionally.