Totally agreed. Bonus system of other casino is transparent and only Stake has hidden computation for unknown reason probably for element of surprise.

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It is probably for the sake of surprise and not accustom their gamblers to receive what they expect according to their accumulated wager, though. Let us recall that gambling relies much on randomness and on the fact gamblers are never able to predict what is going to happen next to their money, I believe it has something to do with that, the fact Stake does not have such a transparent system or have not disclosed their algorithm to calculate their bonuses. Even though it has some sense if we consider we are talking about a casino, one needs to admit there are many gamblers out there who would appreciate more transparency on their bonuses, so they won't feel underwhelmed when they received it and it is less than expected.