Uber's S-1 (quoted below) claims 5,400 direct employees in platform support alone. Interestingly, I've seen an Uber floor while touring a third-party call center in Manila, so they probably outsource even more these days.
Platform User Support
We have invested in a network of global support centers to support our worldwide operations. We have ten primary support centers in Chicago (U.S.), Phoenix (U.S.), Limerick (Ireland), Krakow (Poland), San Jose (Costa Rica), Hyderabad (India), São Paulo (Brazil), Manila (the Philippines), Lisbon (Portugal), and Cairo (Egypt) with approximately 5,400 employees and 400 independent contractors who provide 24/7 support for platform users in the United States and in certain other countries. In addition to in-app, web, and phone support, Drivers can visit Uber Greenlight Hub locations for in-person support.
Platform User Support
We have invested in a network of global support centers to support our worldwide operations. We have ten primary support centers in Chicago (U.S.), Phoenix (U.S.), Limerick (Ireland), Krakow (Poland), San Jose (Costa Rica), Hyderabad (India), São Paulo (Brazil), Manila (the Philippines), Lisbon (Portugal), and Cairo (Egypt) with approximately 5,400 employees and 400 independent contractors who provide 24/7 support for platform users in the United States and in certain other countries. In addition to in-app, web, and phone support, Drivers can visit Uber Greenlight Hub locations for in-person support.
https://www.sec.gov/Archives/edgar/data/1543151/000119312519...
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