As a Bunq Premium member you get 25 accounts with all their own IBANβs, which is nice. In the app you can easily switch between these accounts and connect it to one of your cards, which is also nice.
It would be useful if you can freeze an account for a certain time - for example one month, which you can set up by yourself - so you are not able to use the account for the chosen time which will protect you to save more money.
Vote if you feel this feature will help you to achieve your saving goals more easy.