Publicity remain publicity even it's a good one or a bad one, those casinos will continue to gain inerest as readers and viewers may attract their attentions and start to visit the site, once they deposit their money the chance that they'll be hook and start increasing their apetite to play, and like what you have said, they can drive those veiwers/readers to a potential new client and still the casino will prosper from the new active users that being drive out of curiosity.
What you must know is that casinos usually have their ways to run a marketing and promotional campaign to attracts new gamblers and this could likely carry out on either social media where lot of people do comes across them and they will easily attracts new gamblers who may find interest to at least try the site to see how transparent and reliable they could be, and whenever they tried and sees that they are transparent reliable you would see them sticking to that particular gambling site especially when withdrawal and deposit are made easier for them.