If you think Uncle Sam, or any other government organization, is going to ignore potential tax revenue being made on the block chain, then it's not reality.
There is a reason why major exchanges like Binance and Bittrex are moving away to Europe where regulations aren't as intricate as places like US, China, etc. will implement.
Some of the reasons why people use a foreign exchange like Binance is to avoid some of the tax implications. Even then, it's a dangerous game to be playing because all the information is there. It's just a matter of attaching a face to it.
I know they are not gonna ignore it. But pointing things out helping them is not such a good idea in my opinion. The state is not so powerful that they have the personnel or the means to go after everyone.