Quote a source? All the IRS is doing at the moment is trying to not sink. 35 million backlogged tax returns that have to be processed manually. Does the IRS have "criminal" investigations going on? Of course they do, I imagine it happens all the time. Will they file against every business that has touched Bitcoin? I don't think it would be physically possible.
Opsec precludes me from going into further details. IRS Criminal Investigation agents pursue thousands of cases per year. Bitcoin-accepting businesses are in their sights and the summons they issue (without any supporting evidence that a warrant would require) demand copious amounts of financial documentation. If you never ran a business that advertised accepting bitcoin, laugh me off as a wingnut making shit up. IRS agents are not trying to "clear things up", they are trying bust you. Please, if you are contacted, get a lawyer.