If you do not want your content to be shared by a promoter, you can remove that promoter from the Promoter team. Go to ‘Promoter teams’ in the menu and click on the team that you want to remove the promoter from. Then stand with your mouse on the relevant promoter and click at the right side on the wastebasket.

If you do not want to use a promoter for any team you can remove this person in the same way by going to ‘Project members’.