First question, why are there boards where the signatures cannot be displayed or aren't visible on the forum?
Second question is why do campaign managers exclude certain boards for posting and others where posting is allowed?
First question answer: ask theymos or Cyrus.
Second question answer: ask the campaign manager.
Asking this two questions to public will not get the appropriate answer since it's up to own opinion answer and how they view it. Asking this questions when you're already participate in signature campaign for multiple weeks doesn't make any sense too.
Now I want to ask you: why you increase your post counts in gambling board?