Certainly seems like a questionable move by the bank, though it’s entirely possible we’re missing more context.

There was an article yesterday explaining that the frozen account belongs to an organisation that funds other organisations. One of those is accused of supporting/funding terrorism. So at the end, the bank has no choice and nothing to decide on their own, once they get knowledge of this accused connection. Otherwise they would to get dragged into the case as well and prosecution against them could be opened. Which is why they froze the bank account for now and sent a questionnaire about the organisation and their members to evaluate the situation. That is all, nothing was seized, the title is a lie.