I consider that will be a long night at bunq.
Of course I do not have the big picture. The amount of already made upgrades, the complaints, the faults indicated, all extrapolated to a reasonable scenario for tomorrow, end of this week, next week. Then in comparison an estimation about potential attrition of customers. Then an effort-analysis to fix all the problems within certain time.
Or in other words: I hope you make the right decisions for the next hours and days. I do not want to talk about an emergency, but reading only this thread is indicating a big problem, yet without any statement by bunq themselves.
I have seen a lot - also withdrawing an app-version, going back to the previous version. Followed by a verbose root-cause-analysis, together with a strong plan about priorities, content and schedule. Then communication to the customer to get back trust and confidence.
However, such plan must be started immediately. Announcement of actions (even only highlighting when the plan will be available) must be available within hours. The clock is ticking and counting against you guys. At moment you have to deal with several hundred of upgrades (perhaps). Tomorrow it might be already ten-thousands.
Bunq, when will you start to communicate?