The value of the token/coin depends on its usage. Not only the casino platform but the developer should increase the demand for tokens. And along with that should be listed in good exchange. I think currently casino players are increasing but coin prices are not changing accordingly.
In order to increase demand for tokens, it is important to spread the word about that token in the crypto market. A gambling website may have been able to establish a strong foothold in the market, but it doesn't matter that their token price also increases.
Gambling websites have no choice but to list on major exchanges to generate demand for tokens. Because when a token is listed on a big exchange, the curiosity about that project is created among crypto investors.
I think listing a token on major exchanges with a mindset of generating demand for the token is what leads to pump in the beginning of the listing, and dump at the end of the day, this is a good way to generate demand for a projects token.
I agree more with the first quote which states that gambling developers that own this token should generate demand for it through usage, they should create multiple demand for the token that is totally outside exchange listings, if a token has a good use case, it price can pump and become a high valued asset even with one exchange trading it.
And what also we all need to understand is that tokens with good use case get easier listings process/procedures on major exchanges like binance, coinbase etc, than those that just want to list there for the sole purpose of pumping the price which eventually will dump at the end of the day.