In the gambling industry, the domain name means very little to the ranking of the site. This is an ultra-competitive industry, and the sheer number of links going back-and-forth between sites makes the domain a tiny tiny portion of the total algorithm. You are ranking well for “gambling safety” because that isn’t a term that most people are going after. In fact, that term wasn’t searched for at all last month according to Overture and Wordtracker.