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His current rakeback percentage is around 4% to 5% which is equivalent to average VIP rakeback percentage. I’m not how Rollbit daily bonus work but I think the VIP level play an important role to get the maximum percentage.
I don't play at Rollbit as well, but for sure they have ToS where everything is explained, and before posting the entire conversation (argue) with support he should post their rules about the daily bonuses.
In all other casinos, VIP plays an important role, as PnL, profit/loses... nobody gets bonuses based just on wagering, can you imagine someone wagering millions and receiving a 50% bonus on that wagering? That casino would fail in a week or even faster.