“To encourage players to try out the new crown store, they will get a small 1 day long buff with any purchase. The buff strength is the same whether you spend 1 crown or 1000. You can have up to three buffs at once and there are currently 22 variations. If you make another purchase and already have three buffs, the oldest one should be overridden, and you can also dismiss the buffs yourself. These buffs will remain in place for at least two months but possibly longer to help players with the transition to an in game store instead of web store.”
Content retrieved from: https://massivelyop.com/2019/02/11/shroud-of-the-avatars-cash-shop-is-now-dispensing-buffs-when-you-buy-stuff/.