Again I present another example:
If I deposited 4mbtc and accepting the freespins bonus. Spin through the spins and win the maximum amount allowable by the bonus and then clear the 40x playthrough, despite this incredible achievement I would actually have less money than I deposited. I would have only 3.3 MBTC but I deposited 4 MBTC.
This shifts the favor in advantage of the house by such a high amount that the game is nearly impossible and should not be described as gambling st all. It's either purely for entertainment and not really gambling or its a scam that used magic tricks to calculate their players balances.
Again. No other casino operates under these corrupted rules and calculations. It's asinine.
If I'm not mistaken, 4mbtc is equal to 0.004btc which is in the amount of 76-77$, also according to your story, you entered 4mbtc and the only deposit when it came to the gambling platform was 3.3mbtc/0.0033btc 63-64$ came to your balance at the current price of bitcoin today.
He also deducted quite a lot, I don't know if it's a transaction fee or what? Many crypto gambling platforms have that style. the other one, if you use dollars, the charge is even 20$, but if you use altcoins, the charge is small.
If so, my advice to you is to use altcoins like Dogecoin, Trx, and not Bitcoin. I only suggest this so that you don't end up like the others who gambled in your experience there.