Did you click „Why?”
Next nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg question: Funding via LN costs 10K sats. Is on-chain funding free, other than mining fees? 
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Discussion
Yes, but it didn’t directly answer my question.
WHAT'S WITH THE FEES?
Mutiny is a self-custodial wallet. To initiate a lightning payment we must open a lightning channel, which requires a minimum amount and a setup fee.
Future payments, both send and recieve, will only incur normal network fees and a nominal service fee unless your channel runs out of inbound capacity.
Learn more about liquidity
https://github.com/MutinyWallet/mutiny-web/wiki/Understanding-liquidity