The currency would ideally facilitate trade. Even if it's not baked in it evolves. I remember Diablo 2 people would trade using a particular rare ring (Stone of Jordon). It was essential as you might find rare items that don't fit your character configuration
Ideally crypto would facilitate trade and not take away from the game. But I understand the incentives with the game company using a token as opposed to a natural market that evolved may be off