Any bonuses for users are also part of the marketing strategy, and it's a normal thing that the Stake team makes some changes to it from time to time.
The only thing I hope is that the Stake team won't conduct its marketing strategy the way many centralized exchanges did during the previous BTC bull run. Let me remind you that many of them spent a lot of money to promote their brands by signing multi-million dollar contracts with sports clubs or whatever. However, as soon as the prolonged bearish trend started, some of these exchanges decided to terminate their promotional contracts and get rid of their staff.