It depends upon the campaign requirement. Some gambling campaigns require their participants to gamble as a part of their rule.
Really?! I also advertised many gambling sites for the past 2 yrs. (because my early years here, gambling sites campaign are not yet on trend, ICO does) until now but I haven't encountered such requirement. One of the requirements I unusually experience is the use of their own wallet but other than that everything is the same with a common sig campaign

. Can you please site examples, I'm curious lol.