Why fear a government agency with aging equipment and lack of employees due to continuous budget cuts by politicians who don't want their buddies audited? The IRS can't keep up with tax law changes and collect much of what they are supposed to collect already much less add new and more complex things to track.
Maybe it's different where you live, but my experience is that the only people that can afford to not fear the IRS are precisely the "politicians and their buddies"...it wouldn't surprise me at all to see task forces being formed just to identify under-reporting via Bitcoin and issue threatening letters (e.g. pay what is due or say goodbye to any assets you have) to whoever comes up on that list.
Anyone that can afford accounting services from the Big 4 (PwC, Deloitte, EY, KPMG) is getting this golden glove treatment. I am sure that there are numerous mid market firms with significant amounts of ex big4 staff that are also helping their clients just as much. Small CPA shops will be hit or miss with mostly misses. My results were 20% experience, 20% skill, 50% training by my Big 4 employer, and 10% fear of my employer escalating the situation if they didn't get a sign off from me (I'm not the one that would get sent to represent the client in tax court).
The vast majority of the IRS's work is based on incompetency and fear. Nearly all of the charges they tried to leverage against my clients were false and due to paperwork errors (more often on the client's side than the IRS but not always...not even close to always) that were easy to resolve with minimal penalties and interest.
To be clear, they didn't get to throw the middle finger at the IRS and pay nothing, they paid what they owed which was practically never even in the same ballpark as the bill the IRS came at them with. The people who can't hire a professional Tax CPA to sort it out for them get fucked not because they are the only ones paying what they owe but because they are the only ones paying way fucking more than they owe. That's a whole other ethical problem that should be addressed with the IRS.