Also what are the things that kills such project because even one or two survived for long I don't see many alive till now, they fail easily or turn scam later.
Mismanagement is the number one issue that kills the project. Since mismanagement involves the overall operation of the online casino, being poor on that will lead the gambling project to being bankrupt. Others to save the financial status of the project often rely on dirty tricks that are borderline scamming the player of their winnings by using holes on the TOS that is easily exploited by the project owner.
Becoming a scam I think is planned even before the project is created, so it is actually the end goal of the project owner, to run away with the fund when right time came.
Also what are the things that kills such project because even one or two survived for long I don't see many alive till now, they fail easily or turn scam later.
It's because tokens are not really that necessary at all, there could be from little to no demand if you're also accepting other cryptocurrencies into your casino.
It depends on how the project uses it. If players find the token to be beneficial to them, they will gladly avail of it, the sad thing is project owners often disregard the important ideas that can be integrated on the token making them useless to the development of the platform and just use them to money grab.
One thing that kills gambling projects is obviously if they don't have players to begin with, and those who don't processed withdrawals and then who are blatantly scamming gamblers. Others could have been dead because they weren't able to maintain good security, been hack and drain everything.
Indeed marketing strategy is also one very important aspect of gambling platforms. We can see successful Casinos and gambling site have partnerships with known people, have regular promotional options on their site, and keeps advertising on a different platform to ensure the platform exposure is done regularly.