I think it would be good to have a feature that makes it easy to be able to use Monzo as a positive reinforcement to establish good habits.
For example, for everyday that you do 30 minutes of exercise, you can tap a button that saves an amount of your choosing into a pot. You could set goals big or small, a book or a holiday.
Get healthy, learn guitar, revise, be more productive by creating a habit (known to be the best way to achieve something) and treating yourself at the same time.
I’ve seen this on IFTTT pre-made applets ranging from manual button press to integration with fitness apps; so should be easy enough for those worried about any technical understanding required.
I think the problem with an IFTTT solution (as far as I can see) is ‘Where’s the automation?’
When the ‘If This…’ is revision or practicing a musical instrument, how does IFTTT know you’ve done it and then trigger the ‘…Then That’?
That’s why I think a setting within Monzo would be good. Set the amount, maybe set the activity, have the option to set a target amount and away you go. If possible, have a widget on your home screen that you just have to tap each time you’ve done your daily activity.