This may not be something others are interested in but I thought I’d throw it out there as I find the concept interesting.
This app/platform/whatever-it-is ‘Acorns’ rounds all your purchases up to the nearest $ and invests the change in a diversified portfolio.
What if Mondo allowed users to do this, but put the change into a separate savings account? Unsure how significant the savings would add up to be, but could maybe get you flights somewhere fun after a few months?
Just a thought