This type of campaign will make people aware of your casino so people will try to visit your casino, but if you have nothing special compared to other casino then it will be wasting money or useless only.
I say it is wasting money and useless because people may visit your casino but they may not be interested to play if there is no special offer in your casino.
I disagree. They aren't a waste of money and they most definitely aren't useless since they provide the much needed initial exposure to the site regardless of the fact that they may or may not provide special offers.
They could always run them for a short period to observe whether they are helping or not.
This is primarily why so many gambling sites launch their own signature campaigns in this forum. I observed that they are usually way more helpful when compared to various bounties(Social media etc).