My daughters just about to start secondary school and it would be really useful if we could just give her a card of some kind with an easy way for us to add money to it for her to use for small purchases. It’s such a shame monzo is 16+. It mean I’ll have to sign up with another provider which is less than perfect 
I got my first kids piggy bank account with Barclays. 30 years later I was still using Barclays!. Just think of the customers you could be losing!