Be very careful giving advice on what is legal and illegal. If you think that someone puts down they are a drug dealer with large amounts in unreported income that the IRS won’t report that then I have a bridge to sell you.
It looks like you are correct that the IRS can report you for doing illegal activities.
I mistakenly thought that they can't. They are stupid for doing that because now why do they expect anyone to report their illegal activities? If they were smart the would provide amnesty for the illegal activity, and then drug dealers may actually report their income to avoid being prosecuted for tax evasion (which is probably much easier for the govt to catch than actual drug dealing).
That doesn't affect this AP PP discussion though because it's not breaking any laws.