At this stage, they do not have a way to determine who is and who is not Crypto currency users. ^easy^
I don't know what you are talking about

all the exchanges that are accepting fiat are following the KYC AML and all that BS and your bank already knows and tells everyone you have made a deposit to a bitcoin exchange, so they already know you are a bitcoin user.
also exchanges like coinbase (One of the biggest exchanges currently) is working directly with the government, IRS and reports all the transactions that is made through them (I'm only partially kidding).
and these are the ways regular people use, and not-regular people who are using some other methods are not going to pay with bitcoin to go on "the list"