I changed my trust pilot review as well since they don't offer me any bonuses no matter how much I deposit/wager, I have lost crediblity with them.
So, you have submitted
a negative review about Duelbits on Trustpilot as you aren't satisfied with their bonus system! You shouldn't expect a higher bonus from them by wagering on the BlackJack game as it is a low house edge. Duelbits bonus parameters aren't hidden. Therefore, I can't see any reason to raise questions about the transparency of Duelbits bonuses.
Just lettting people know that when you are about to reach your VIP level, till you reach there will be no bonuses, no matter how much you deposit.
Duelbits gives rakeback, daily, weekly and monthly bonus to each user. All these bonuses depend on your wager and house edge of the game. Duelbits also give rank up bonus. Only $1k wager is required to reach the first VIP level. It isn't difficult to reach the first VIP rank. The bonus has no connection with deposits.
