Bottom line, if you take someones money, you do a job, within an agreed timeline (or communicate any significant deviation) or you give the money back.
Maybe there should be a section to record commissions. Not moderated under approval as that would add more work, but at least it could serve as a public record.
In the few instances where I take a commission, I try not to take any money upfront to avoid SOVED contamination

I do budget builds only so that’s not a big risk plus usually the watch will sell if buyer defaults… still I would be very comfortable with having a public record upfront