Besides what others have stated before me is the fact that running a casino site is no joke and require continues development which can be some time stressful for the team and they may decide to move on to less stressful ventures such as investment which does not require much skills compared to running a gambling site and another reason is if the casino was running an unregistered site and government unfriendly policy forcing them to close down.
There's no such business that wont really be that stressful for its owner because you would really be needing to mind off about new perks and gimmicks to make your business to be appealing
because if you dont able to retain such thing then expect that there would be drastic effects which might cause for your business to go out of date or would really be overtaken by those competitors.
Gambling industry is really be fierce when it comes to competition and you shouldnt really rest on finding new ideas for people do still able to go into your business.
This is very true, if are a gambling business owner for years, for sure, you've experienced a lot of highs and lows.
And this business will take a serious toll on your mental health. Other than the fact that there are also other factors involved.
Competition, maintenance of the site, other legal requirements and so on.
So it is understandable if some will quit and just venture on another thing.
But it is commendable for some casinos who announced their exit and letting their customers withdraw their funds.
While some just disappear into thin air and never heard again. There is no forever in this world.