I suppose it depends how much it would be. I suspect I cost Monzo very little - but nor do I generate any revenue.
(I’ve said this before, but I think there’s an issue with the culture of “free” banking in the UK. It means that not only do a minority of people in chronic debt / overdrafts subsidise others, but that it makes it much more difficult for new entrants (Monzo and its like) to compete on price - because it’s ultimately obscured behind “free”).