I don't think Theymos would do such a thing, a shilling campaign has been in existence ever since, and not only here in Bitcointalk you can find it even in restrictive forums, joining a campaign is a privilege, you are there because you are qualified based on the rules and requirements laid out by the campaign managers and the campaign was launched between the agreement of the campaign managers and project admins to brand the site and generate leads.
So it breaks that agreement if you are a participant of let's say casino and someone asks for a list of the best casinos and you leave out the casino you promoting it your signature.
It just breaks the agreement of branding and lead generation that the campaign managers and project admins agreed to, honestly, it's not easy for campaign managers to request the project to hire him he must lay out a plan that the project admin will agree that he is qualified to brand a project.