The IRS is cracking down on Uber drivers and Airbnb hosts because of the amount filed by Uber and Airbnb to the IRS about how much you are making.
Hundreds of millions of dollars in taxable income go unreported every year by Airbnb hosts, Uber drivers, and similar sharing-economy workers. As the federal budget gets pressured, expect tax authorities to come calling (The IRS May Crack Down on Airbnb and Uber Income and Unpaid Taxes).
How much did Uber & Airbnb said you made?
In a side-note: Googled News results involving police and government: 5 million for Uber, 530,000 for Microsoft