Yea pretty sure they cannot do this because it’ll be against their business agreement with those saving partners etc. Meaning that if and when those partners see that Monzo are putting “un-ethical” badges on their products, they’ll not want to do business with monzo because of that
I agree that more needs to be done to help minimise our environmental impacts but I wouldn’t want them mixing in what Extinction Rebellion are doing (in some places) with banking, and would rather them just improve on how green/ethical they are in general with their business operations.