Two years after the launch the game gets loot boxes. They contain only cosmetic and Survival mode items so they don’t add you any competitive advantages. They can be bought only for the in game currency that can’t be bought for real money. So, to get loot boxes you need to play more - and that’s it.
While fans are already angry about this decision, for me this situation shows loot boxes done right. It gives you another reason to play more but doesn’t try to get your money and doesn’t turn the game into pay-to-win.