Quite curious if this has been the case. Obviously I'm hoping it haven't been the case.
I'm sure they have. In the IRS request to Coinbase, they cited multiple cases of tax evaders who had used Coinbase to facilitate the tax evasion. They used these cases to argue that Coinbase should turn over all customer data, so they can find similar tax evaders. The court rightfully rejected the request, but the underlying facts make clear that they are already coming after people for this.
If you are in the US and you have large wires in and out of your accounts, or you do high volume on LocalBitcoins, I'd be careful and do everything by the books. Bitcoin is no longer in the shadows. The taxman wants his cut.
This is what upsets me. A local bitcoin exchange was also forced to turn over all customer data, as law enforcement were looking for money launderers. However I bought some bitcoin through my bank account at their exchange.
Considering my country gets people into prison longer for tax evasion than murder. I'm afraid that one of these days they'll consider bitcoin as tax invasion instead of a "share".