I see the casino is closed and I have disputes open with Casino guru how will it resolve if the casino is now closed.

It depends on the casino license and the company behind the casino.

For example, MGA licensed casino and company which owns several other casinos will pay the players after casino closure but some unknown company from tax paradise with only one unlicensed casino probably no. 

You are probably talking about Joka Room Casino. As far as I know, they made rebrand of their Johnny Kash casino (now King Johnnie) or at least this casino is using the same platform.

Hard to say what they will do, but in the past, they were solving their complaints, so I am optimistic in this case.

The MGA casino and the company that owns several other casinos will pay players after the casino closes. But I think an unknown casino is unlikely to pay anything. So it depends on the casino license and the company behind the casino. I play at https://www.bingoon.se/speed-roulett/ and I can say it works great for them, but the important thing is that it is licensed. Luckily, I haven't had any problems with payout of winnings yet, and that's the most important thing. But I sympathize with a lot of people who got caught in the clutches of all the unscrupulous people.

It happens. We've got almost 4000 casinos in our database. There's always a chance that a new one is founded and another one closed. Some casino brands even get closed because of their bad reputation and the owners just open a new brand and do basically the same...