I am sure irfan_pak10 is a Muslim and Muslims usually take gambling as a sin, I think that's the reason for his non-interest in gambling campaign.
I really don't know anything about Muslims, why can't they be involved in gambling? This is not gambling, it is advertising, advertising work why not allowed 
I am quite curious about it 
As a charity campaign, I think it should be applauded for participants to carry this signature for free