That is the main aim of the government, they plan to know everything about the citizens they care very less about all for their selfish gain.If there is a tax that is implemented later on into exchanges and the crypto world then I am guessing that this will likely be in terms of crypto and not fiat currency because you are generally taxed in the currency that you are using. So perhaps it will be a percentage of the crypto that you have or something of that nature. Tax however shows tracking of crypto and so forth which kind of may defeat the purpose for which it was created.
Although I don't have a problem with taxing, because it will curb the incidences of fraud, money laundry etc, I do have a problem with government's regulation of how people spend their money or what kind of money they should posses.