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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.