I have mixed feeling about this, especially if it was a fixed charity presented in the app for all users.
Who would choose the charities that we can then choose from? What about a majority of the 800,000 users who are not on these forums? How do they choose? I donate mainly to the Manchester Children’s Hospital Charity. Will it be on that list? Or will it be only national or London focused charities as the forum might have a geographic bias?
In the end, if people wish to donate to whatever charity, they can set their own rounding up coin jar and then donate it to the charity of their choice. Monzo need to focus on extending the functionality of the banking side of the app!