I don't see much connection between Bitcoin price and the increased popularity of the casino business and these is clearly different from each other, but there is no doubt that the gambling market has witnessed an increase in traffic which have resulted in new development and competition in the market and that have indeed pushed many casinos to make an extra effort to promotions and this is why many of them are spending extra funds to increase their visibilities is very important for us to know this fact.
Much more also, Bitcoin is just a currency that is used among other currencies to make deposits or to place bets and also withdraw from online casinos, so for sure it may contribute to the popularity of those casinos but certainly not an integral part of the casino.