I think it would have been better if they took the interest rates and then used that to subsidise the Premium tier's cost, to be honest.
Then again, I live in a country where typically banking has been free in all of my lifetime at least. That and the 0.27% interest rate is considerably lower than anything I could find in my country (I think my lowest account pays out 0.5%), but maybe that's more a difference between the two different currencies.
To ask a question, is there an option only to invest in Sharia compliant companies? I'm sure this could have quite a lot of potential Muslim customers actually sign up to Bunq. It's definitely very nice that you can choose to invest in only green companies through, for a better Europe!