Honestly buying a digital game is perfect. Steam can just give it to you right away, and if the transaction doesn't clear they can just revoke the game later.
That's only addressing one issue with Bitcoin but the issues abound. I don't know all the issues that would happen but even my rudimentary understanding of payments can see that the high transaction costs are a problem when most of the games I buy are less than 5$.
There are ways to design around these glaring issues but Bitcoin is just a worse product for many transactions (and it's not like payment processors are a particularly good product to begin with).
There are ways to design around these glaring issues but Bitcoin is just a worse product for many transactions (and it's not like payment processors are a particularly good product to begin with).