I didn't click on that link, but think about it: if this casino hasn't paid out for many months, they disappeared months ago. So it's very clear that it's a casino scam, therefore it wouldn't make any sense to use anything created by them. Another point, if the app was created by the owners of Fun Token, it also wouldn't make any sense to use such an app because I'm sure it would be a scam. My point is simple: anything involved in a scam shouldn't be used. Now, seeing all this (casino scam, currency involved in casino scam), how can you still doubt that the app is a scam? Either you created this app or you like being deceived and robbed.
Why not click it? It's Google Play. I checked it out a bit... It's a game from "Reward Riot Games", and they have a few more games.

"Reward Riot Games"... It's not "Riot Games", they added "Reward", and this is a big red flag. I tried to find more about them, but I ended up with an AI search, and this is one part:
Reward Riot Games on the Google Play Store is not the official game developer, but rather a deceptive third-party publisher that creates casual games (such as Color Pop Quest and Knife Strike) designed to lure users in with fake promises of real-world money or game currency, which they do not actually pay out .
In any case, I am not sure we can say if "Reward Riot Games" is connected to Freebitcoin.
Maybe some specialist can dig deeper and find out, but until that happens, everything else is just speculation without any evidence.