This is why you don't use coinbase or any centralized exchanges...the profit significantly off the withdrawal fees they charge you. And most.people don't realize they're getting ripped off. CWallet is the only centralized exchange/wallet I use to swap. (really cheap fees, over 100 coins and tokens and they feature lightning under the name SATS) But even a couple of their withdrawal fees are way higher than it actually costs to transact on the blockchain. However, they only charge a set fee of ten SATS to withdraw via lightning.