As long as I remember, the main difference of the VIP program in duelbits compared to other casinos is about the calculation of the level up reward. Most other casinos use like a fixed amount for the level up reward while duelbits is based on the wager and house edge. It means that we may have different level up rewards for the same wager amount but we play different games. Correct me if I'm wrong.
Oh that's interesting didn't know that! All other vip casino programs are only based on wager and don't care on what game you do it. Some casinos give you more points when you wager on sports but that is it, so it an interesting approach from Duelbits. So based on this, the reward you get when you reach your next vip rank is higher when you play on slots than on the house games? I am far on reaching the first vip level, but I am curious about this right now.
AFAIK, Casino that have house games such as dice or low house edge games calculates their VIP points based on the house edge percentage. Since it will unfair to farm VIP point using dice with 98% win chance rate to sports bet or slot with higher house edge. But casino like sportsbet and livecasino determine the points based on the amount of wager without considering the house edge.
Rakeback is the one that being determined based on the house edge of the games being played. I think this is what the Duelbits VIP rewards inspired since they focused their reward on multiple rakeback aside from level up bonus reward.