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IMO, other reason why they do these.
It's for the engagement as well, by using this kind of claim the user it self will asking or comment on their social media. Even is a bad comment, they taken those as engagement and bring some trafics for them.
Example: Jooking about "Monthly" even the user getting mad, and other. Still they do these, they really want trafics as much they can for their social media as well.
Totally agree on this. The discussion on thread alone even without signature campaign is more on bonus speculation since every bonus here has a mysterious calculation.
What makes Stake bonus so good is you can get a weekly and monthly bonus even without a wager or less wager due to their unique VIP computation.
Discussion on bonus is indeed engaging topic.
Well, indeed we and other would not be talking about those bonuses of Stakes did not keep this aura of mystery on how big our next bonus is going to be, perhaps they have noticed how bonuses are not such a relevant topic on other gambling communities or casinos and their marketing and PR department thought it was a good idea for them not to make public the way they compute bonuses realizing they were going to get some engagement plus from gamblers.
After all, gambling is unpredictable and if bonuses are unpredictable, they become just another tool or low paced "game" for the casino to keep us engaged.