I think you’re mixing up AdWords (short textual advertisements on Google search result pages) with AdSense (advertisements on other sites, with Google mediating between advertisers and people with webpages).
[EDITED to add, for clarity: Ads on the SI’s sites would be AdSense ads (the SI offers advertising space and Google pays them). michaelcurzi is talking about ads in Google’s search results (Google offers advertising space and the SI pays). The two are almost exactly opposite.]
I think you’re mixing up AdWords (short textual advertisements on Google search result pages) with AdSense (advertisements on other sites, with Google mediating between advertisers and people with webpages).
[EDITED to add, for clarity: Ads on the SI’s sites would be AdSense ads (the SI offers advertising space and Google pays them). michaelcurzi is talking about ads in Google’s search results (Google offers advertising space and the SI pays). The two are almost exactly opposite.]