How do you think google makes money ? No,they can't do that since the end users are the developers who sell their apps on playstore to get paid.How'd google pay their app developers on every purchase if they're aren't willing to accept bitcoins from the user ? I'm sure such similarities with different have been brought up before but due to the complexity and demands of the users/companies,a certain standardization was needed,which the play store still runs on.Moreover,prices of bitcoins keep changing,either way one suffer's loss each time it fluctuates.The idea is good,not unless you can shop from Walmart with bitcoins.