I have read BenCodie's comments several times, I think he is a person who has principles and beliefs.
What principles are we talking about here?
He strongly believes that gambling is awful, immoral, destroy people's lives etc yet he has no issue taking money from the very same gambling company to help them "ruin" people's lives.
Someone with such opinion about gambling and with principles would never join gambling signature campaign.
Are there any rules against it? otherwise, anyone can join, regardless of principle. I think the people who have the most right to judge this are the campaign managers and BenCodie himself. We do not need to interfere with his principles and impose our principles on him.