https://www.cnet.com/news/google-to-require-full-benefits-health-care-to-contract-workers-report-says/

The change comes the same day more than 900 Google workers reportedly signed a letter demanding better treatment of Google's extended workforce, commonly known at the company as TVCs (temps, vendors and contractors). The letter, from March 27, complained about Google shortening the contracts of several members of the Personality team for the Google Assistant, according to a report by The Guardian. The team comes up with the voice and tone of Google's digital helper software, a competitor to Amazon's Alexa and Apple's Siri.

The letter reportedly asserts that TVCs make up more than half of Google's workforce.