Anything the band do as a whole should get split evenly.
I think it's fair that any extra work someone in the band does for the band, for example, music recording and production or "content creation", artwork or other promotional work, songwriting, driving, etc and should be recognised and a little extra agreed for them by all.
Some gowl sneaking money out without the knowledge or prior agreement of all of the rest of the band? Nah, that's not on at all.