This is a systemic problem with tax enforcement in the US in recent years, caused in part by reduced funding for the IRS. Wealthy people can afford expensive legal defenses, which makes it more expensive for the IRS to pursue these cases, so they focus instead on easy to win cases against low income people.

>According to data released by the IRS last week, millionaires in 2018 were about 80% less likely to be audited than they were in 2011.

Audits of the rich continue to plunge while those of the poor hold steady, and the two audit rates are converging. Last year, the top 1% of taxpayers by income were audited at a rate of 1.56%. EITC recipients, who typically have annual income under $20,000, were audited at 1.41%. [1]

[1] https://www.propublica.org/article/irs-now-audits-poor-ameri...