Magic login links, insecure?

Apologies if someone suggested this already, but can someone explain what would be bad about the app requiring the magic link then your PIN to log you in? Seems like a simple way to improve this a lot without hoop jumping or having to remember more passwords.

I know it’s already required if you want to move money around, but simply being able to see someone’s transactions can tell you a lot about them that they might want to keep private (“oh look they went to a gay bar at 2am”).

If you then think about abusive partners/exes, who have a decent probability of having access to their email to begin with, Monzo’s awesome instant transaction notifications become a scary tool they could use to literally track them (“the [abusive expletive] is at a cafe, let’s pay her a visit…” etc). Yes the customer would be logged out, but it’s not like the app explains why that happens (I got logged out a few days ago and have no idea why), and the magic link makes it so easy to log back in I could imagine someone not thinking much about it.

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