but it's penalty rates on overdrafts for less well-off people that are paying for it
That's why the FCA brought in rules that authorised and unauthorised overdrafts should be charged the same. And fee-charging bank accounts aren't necessarily the answer; my NatWest fee-charging current account currently has a six quid usage fee, plus daily charges and interest- for my arranged overdraft. I went into it by a tenner by mistake and the fees were pretty much a tenner, again, for an authorised overdraft. So the month's interest rate for that £10 was 100%; as an APR, that is a staggering 409,500% APR.
The FCA wanted clear pricing to promote an informed market. Not just to compare overdrafts, but to compare different types of short-term credit. Suddenly borrowing a tenner off a credit card at 30% APR doesn't sound so bad, does it?
That's why things have changed. And as all banks are pretty much charging the same rate, the exact opposite of what normally happens in a competitive market, the FCA have asked for details of how they have calculated this rate.
Finally, threats of bank poverty are grossly overstated, as most banks will currently chuck up to £200 at anyone opening a new account.