there's a ML model that ranks ads relative to a query. Contractors get paid to provide the "ground truth." You can read about how it was in 2008-10 here: http

there's a ML model that ranks ads relative to a query. Contractors get paid to provide the "ground truth." You can read about how it was in 2008-10 here: https://albertcory50.substack.com/p/working-at-google-ads https://albertcory50.substack.com/p/working-at-google-ads Undoubtedly it's different now.