Well, at least your fake news didn’t get Donald J. Trump elected 
The £40 figure was mentioned in a recent article referenced by @alexs and is the cost per user per year to Monzo.
Monzo CEO Tom Blomfield tells me his startup bank loses on average £40 per year per user at the moment.
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Blomfield adds that £40 loss per user per year compares favourably to banks, which will regularly pay over £100 in marketing and offers to acquire a single customer.