Bitcoin might be the biggest currency by market cap, but apparently not by volume:
miniblog.
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It's weird how smartphone game design has converged on certain features. I downloaded Tetris (Blitz) and I could spend money on in-game currency, it had daily challenges, and even XP!
I'm not sure how much this relates to revenue vs users just preferring this design.
I'm amused to learn that many MUSHes have a notion of in-game currency used to pay for compute: https://github.com/pennmush/pennmush/blob/master/game/txt/hlp/penntop.hlp#L794
This very much predates Ethereum or AWS Lambda pay-per-API call!
