Unlike the market trend usage of cryptocurrencies on gambling stays constant. This seems to be the reason why there is not much of deviation in the market of those mentioned cryptocurrencies associated with gambling sites. Investing on these coins in the bear market doesn't look like a fair decision, because these tokens won't show much in growth when the market turns bullish.
During the bearish and bullish market the gambling industry is the one that is able to withstand. More ways of promotions are being done, but something as making it popular through sporting events seems to grab the attention of more investors which might boost the market.
To me this makes sense, we also need to take into account that a great deal of the coins that we have in this market have nothing solid behind them and as such it is natural they are extremely susceptible to the manipulation that is going on in the markets, but when it comes to casino tokens we know there is a company behind them which can back up the price of their token with the number of clients they have and with the profits they have gotten over time, so it is not surprising that casino tokens seem to be more resistant to the fluctuations in the market.