I have a little confusion, to be honest, if that user had been banned from wearing signature (presumably also ban wearing avatar), my question is how that user wore the scam gambling site avatar in the first place or the banned restriction was for the signature only not include the avatar and they still can modify it to wear avatar, if so, they can still promote whatever they want even though they are ban wearing signature.
ronaldo40 is banned from
displaying signatures until March 2022. He very clearly still has the ability to wear and change his avatar.
There are very few avatar campaigns out there that do not also require participants to wear a signature. I am not aware of anyone successfully participating in an avatar campaign that is banned from wearing a signature, so I don't think this is a pressing issue.