John Do That they are buying stuff with their own money is their right. It also kinda proofs that they weren't required by law to invest in government bonds otherwise they would have had to do this from the beginning
What I'm more upset about is what they are doing with my money. See below where they say customers money is only stored at the ECB:
https://together.bunq.com/d/5030-behind-the-scenes-why-we-introduced-freedom-of-choice
Their slogan "we don't invest in nasty things" is not true when they start doing things like personal loans, mortgages or government bonds. If only because they can't control what a person or government will actually do with that money. Is buying a diesel car a "nasty thing"? Is buying a gun a nasty thing? Is building a house in the woods a nasty thing? Is building a coal power plant a nasty thing? Everybody might answer differently and buqn can't guarantee that none of this will happen with the money they invested.