Google search is not closed source as it is a hosted service. It would be if it was redistributed under closed source license. This is why RMS himself said he uses Google.
> It's just pretending to support OSS. Without actually giving away the crown jewels.
It has not given sources, but Google gave many papers about the technics they use such as map/reduce and compression which enable projects such hadoop, yahoo search and even Bing.
Where exactly did he say this? He's opposed cloud services from the beginning and designed GPLv3 to attack web apps.
Last I checked, the man scarcely browsed the web.
Hence, he was still lying about Stallman "using Google search".
My cry of shenanigans stands.