That’s not true. The governments of the world (including the U.S) are seriously looking at it and sizing up the lay of the land before acting — Otherwise it would have been taken down already. Granted they may not adopt it, but there is certainly a possibility.
Oh and if the U.S decides not to adopt it, then be assured that Apple and Google and the like will not be accepting it.
US Gov May regulate it...but they will never adopt a currency which can be tracked for each transaction that is made.
Other counties have outlawed it but I think the US Gov may take a look at regulating it...maybe even offer exchange at US Post Offices. It may make it easier for them to tax the citizens as well, which I am sure they will have an interest in.
There will be a crypto-currency for Apple and Google, mark my words...whether or not the US Gov “adopts it”...unless the US outlaws it specifically.