I think there's no casino bankroll will give a real passive income for every day/month/year, they not guaranteed it.
But the bankroll usually give they total bankroll and give a percentage of your profit, for example crypto-games bankroll.
They do give a passive income, you just have to invest a lot to make any significant kind of profit.
You're not going to get any income worth while when you invest less than 1 BTC.
But if you invest like 10 or 20 BTC, you'll see a really nice passive income if you leave it there for a longer period of time, that's the definition of passive income
Like Adzino has said on the first or second page of this thread, Crypto-Games is very transparent with their statistics, you can basically calculate how much you will make in the long term.
And something that a lot of people don't take into account:
Crypto-Games has a maximum win on dice games, meaning that that chances of losing your entire investment are next to non-existent.