If you update the Australian Wiki with your experience, that’s the best way to benefit other Monzo customers who are forum users:
Commonwealth has increased fees from AUD3.00 (reported in Jan 2020) to AUD7.50 in just over 2 years? Wow.
EDIT: Just re-read the Wiki thread and someone posted the AUD7.50 charge was applied in Feb 2020 - so in actual fact it may have gone up by 150% in one month. Double Wow.