Of course, you could probably save a little by sending yourself USDC from your @Cash App cash balance first instead (at least while that fee is still 0%); then, using something like @Boltz - Non-Custodial Bitcoin Exchange or @Blitz Wallet to swap from USDC to pay an ln BTC invoice. All this just makes it seem like Cash App doesn't have its incentives balanced out quite right yet. (and the end result is a slight disadvantage for using Cash App for BTC by comparison)