Monzo asks customers to change PINs after storage bug discovered

Assuming I read this correctly, this means 1/5 of Monzo's 2.5M customers now need to change their card pin via a visit to a cash machine, more importantly if those customers used the same pin on multiple cards (as many customers do for convenience) they will need to change their other bank card pins too. 

absolutely shocking!  Are these guys a Bank or are they just playing at banking?

One of the competitive advantages of the new entrants is that they're under less scrutiny than traditionals.  Imagine, the noise if this were NatWest or Barclays?

WP: They are indeed a bank, and showing the older ones how transparency works.  Can you guarantee that this has never happened at your bank?  I used to struggle to get hold of mine, let alone hear from them proactively.  Did your bank spot the Ticketmaster fraud and re-issue cards to everyone who'd shopped there, before notifying Ticketmaster, who previously had no idea?  Banking is moving on, which is a good thing.  Who is under less scrutiny?  The rules are all the same, and the customers of these new banks are a lot more active on social media...

According to the common narrative:

Traditional Banks make Customers visit Branches because their UX sucks. 

To that we can now add:

Challenger Banks make Customers visit ATM Machines because their Security sucks.

LOL, I never imagined this is how the "UX versus Security" Holy Grail will be cracked eventually:)