Monzo have said they have positive customer unit economics (ie: they make a little bit of money for every customer they get) back in October:
This image is from the October Open Office.
However:
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The move to integrated Savings Pots with other providers may have caused the amount of “Deposit Interest” revenue to go down.
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I suspect the cost of Customer Operations has decreased.
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I imagine Monzo have additional revenue from increased personal loans.