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It's true that the gambling based tokens usually didn't give high pump . Because those tokens are only used by gamblers and So they try to keep them in a stable flow . Even then some tokens are seen to pump when they are listed on good exchanges. And if you see currently most of gambling website make their own token for giving gamblers extra facilities. And as your state it's one more cause those token is not pumping because of the bearish market .
It depends on the feature of the Casino tokens but it usually pump hard during initial listing of the tokens and just stabilize later on because casino is using it as a reward to all users that playing in the casino in exchange for there bets. The price is just stabilize because someone is buying either the casino buy back or other trader while players in the casino that gets the token as rewards keeps selling. Usually this kind of token shows an insane amount of growth after the token supply allocated for mining it is already empty which means there’s no new tokens generating to add in the circulating supply.
It’s not true that Casino token price don’t pump high because they are pumping on early stage if you will check the price chart using long time frame. Only those casino failed token didn’t pump much since the beginning due to lack of demand.