Investing in casino tokens is similar to investing in gaming tokens like AXS, ATLAS, or ILV. They can't be considered a long term investment and is only profitable during their hype. They are also centralized so there is no guarantee that they will survive for many years and if the company owning them shuts down, the token will be abandoned and its price will definitely lose value.
Its not a matter of Centralized or Decentralized tokens, no one will be 100% guaranteed. If gamble tokens is good utility why it will not be long term? i see a few gamble platform surviving for the last few years and their tokens have good enough utilities in the market. But i'm not fan of holding gamble tokens, especially long term i will never invest.
There is no use case of the tokens but only for staking as we see even the MBET that you have in your signature. Staking these tokens however give the investors the edge to earn passive income if they hold a lot of it. Betfury I think had lots of investors from this forum because it got a ton of attention when it was promoting and seem a serious casino as well. But as said, casino tokens are meant just for profit sharing from the revenue of the casino.
Holding for long term will just keep a holder losing the value. It would be best to also dump during the bull market increase the stash if you can in the bearish market.