Casinos specifically forbid this usage in their terms of service. They will disable your account if they catch you doing this kind of activity with their platform, because it will get them into trouble with the authorities.
No one's stopping you from creating a shop, and adding some side games to it (You don't even have to mention all the data of players, or even people who purchase stuff), even if someone ask you for the data you can always say something like 'Our database if limited, we don't make much in sales so we can't afford to expand 'For a gambling website this excuse has worked out just fine', 'there were others with all sorts of other execuses'... only for a few days of data is stored, use something like MongoDb free version for the app, with anonymous hosting, and yes, make multiple websites, not just single, if one is taken down you'll learn from it and possibly won't repeat those in the next one, keep deleting stuff, after ecrypting with a password even you can't guess... (This is just one possible solution out of infinite others, and yes, it's not even perfect.)
It would be even better to set this up in some place where this kind of activity is not discouraged. I won't make it this complicated.
