https://www.forbes.com/sites/stuartanderson/2019/10/28/latest-data-show-h-1b-visas-being-denied-at-high-rates/
Denial rates also are high for H-1B petitions for continuing employment, which, as noted, are used primarily for existing employees. An October 2017 USCIS memo made it less likely adjudicators would approve applications for H-1B visa holders to extend their status. The denials have ended the U.S. careers of thousands of people, forcing them to leave the country.