When the arbiter states "
I have repeatedly tried to contact the casino but have had no success" it shows the world that BC Game are not interested in preserving their reputation. If they are not going to counter any allegations made against them (or be selective in the ones they do), they have zero credibility.
The complaints against them continue both in the forum and on other platforms. Keeping aside the USD$ amounts in questions, I would not be surprised at all if the recent events were a precursor to them going down the exit-scam route.
A Casino Guru complaint filed by a player from Brazil on July 21 was closed today as unresolved after 42 days because
BC.Game Support refused to cooperate. The player’s situation was similar to mine, involving a failure of the casino’s loss limit tool. The disputed amount was even smaller than mine. The player only sought 3,117 R$ (about $572 USD), yet
BC.Game Support still stonewalled and refused to provide a single response.

The complaint can be found here:
https://casino.guru/complaints/bc-game-casino-player-s-loss-due-to-system-failureThis shows a clear pattern. Even when the stakes are as low as a few hundred dollars,
BC.Game Support refuses to engage, ignores evidence, and counts on complaints being closed unresolved. If they behave like this over $572, what hope does any player have when the amounts are larger?