I visited Shuffle twitter page and I found a lot of content and images unrelated with gambling or casinos, there are pizza images, alcohol, drinks, comical images, browsers, food, etc.
Are you sure you have visited the official twitter account of shuffle? I have been a follower of shuffle for quite long time now, maybe more than 3/4 months but haven't seen anything like that. At least I can't remember whether I have seen anything like that. Here's the official account of shuffle-
https://twitter.com/shufflecom