Comment by pndy

In the last August Polish internet bank mBank had two "issues": they sent out of sudden 3 notifications onto mobile devices, one even literally saying "push notification test" and the other included some of Polish diacritics [1]. Site went offline soon after these were delivered. Then few days later, database was damaged in a way some clients could see account balance and personal data of other people - that was fixed relatively fast but permanently disabled the feature of accessing recipients list in shared accounts. No idea if that was fixed - my family moved accounts elsewhere.

[1] - https://niebezpiecznik.pl/wp-content/uploads/2020/08/mbank1-...