Fun fact: Not all features have to be a direct means of making money
This game is literally a TCG, but the T part is gated behind either time or a paywall. This game has made over 500 million dollars. That is an unfathomable amount of money within a couple of months time.
I’m sure the company is well aware of this, but releasing really good free features prompts users to play more. Playing more increases the desire to perform the other actions that can result in them making direct revenue.
We don’t need a different currency for every action in the game.