With an ecash wallet users can hold 100 sats without opening a channel or dealing with liquidity issues. I just sent corn from stacker news to my e-cash wallet via lightning, ecash isnt bitcoin but its pretty interoperable and will likely replace lightning as a medium of exchange.
That's nothing to do with ECash, same is true of SQL... custodial sats are custodial sats no matter how you authenticate to the server
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