Hey, maybe my wording was a bit off, I can confirm that we have never paid for any types of reviews, never had and never will. Though I stated Positive ones as I assume no one would pay for negative reviews 
I think that you should ask your staff if that is the case. I very highly doubt that your casino has received all of the positive reviews from 100% legitimate user experience. I am almost certain that some form of incentive has been given to at least some of the people who are writing reviews about DuckDice. That's just my opinion though.