Again, the government in haste enacts laws. How are they going to control it? Such an opportunity, as I understand it, no. Or will they force exchangers to cooperate?
The taxes reports are basically based on trust. You report your income and they believe you are not lying. They have several ways to control it, like they can control your salaries. But once they figure out you cheated be sure they won't forget you.
Some banks accounts owned by exchanges are well known, more countries are also using big data