Andrew Garin, Emilie Jackson, Dmitri K. Koustas & Alicia Miller in this NBER paper:
We document the dynamics of tax-based measures of work mediated by online platforms from 2012 through 2021. We present a measurement framework to account for high reporting thresholds on some information returns using returns from states with lower reporting thresholds to provide a more complete estimate of total platform work. Updating data through 2021 allows us to provide the most comprehensive estimates of the COVID-19 pandemic on tax filing behavior.
We find that the number of workers receiving information returns not subject to the 1099-K gap increased dramatically during the pandemic, with least 5 million individuals receiving information returns from platform gig work by 2021, nearly all from transportation platforms.
We present evidence that the availability of expanded unemployment insurance benefits resulted in many individuals who were platform workers in 2019 not reporting any self-employment income in 2020-2021. At the same time, other services done by platform gig workers increased dramatically by at least 3.1 million people between 2019 and 2021. Interestingly, the broader 1099-contract economy follows a different trend, declining during this period, suggesting the challenges for tax administration are largely concentrated among platform gig workers, at least through 2021.
Mostly Economics 
