The Adkinsbet gambling site use to have this similar scenario when accounts wearing their banner continuously talking about the site favors and now where does that site goes?
At least adkinsbet is now gone. (I don't see their signatures anymore) They did that much.
1xbit however, is shameless as fuck. They don't give a fuck about what you think about them. They are fine with it as long as there accounts that carry their signature.
And since scamming is not against the rules, they do it freely. It is still a win win situation for both the sig campers and the casino.