Distributing their token as an airdrop to those that gambles on their site is not a problem, but where I am still not convinced is if the token are even worth something reasonable, because I know that before you gamble to the extent when they will decide to issue the token to you, you may have lose a lot of money, but the big question is that is the token even worth gambling frequently for?
Because due to the motivation of claiming the token, you are likely going to gamble too frequently, which exposes you to addiction, so it even worth it? I mean the value of the token, like how much are they even worth?
If it is restricted to gamble on the casino Reroll, it will not result in selling pressure on the market in the future but it's not like how it will be done. Tokens will be listed on either centralized exchanges or decentralized exchanges or both, and even there are vesting time, at the end there will be many tokens available to be used for gambling, trading or holding.
Selling pressure is a necessary part of a market, because without selling, there will be no reason to buy it and there will be no buying demand. To build up a strong token, utility for the token is important together with not too inflationary tokenomics, and there will be bigger demand with buying force than selling pressure. The token only can gain its value, then reflect as price and trading volume on the market if the team can do these things which are truly challenging.