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Re:Alphabet Announces First Quarter 2022 Results by cmrdporcupine on Tuesday April 26, 2022 @04:37PM (#31172850)
Both.

In reality almost all of Google is hosted on Borg. But I worked briefly on a project that was heavily interlinked between the two. I believe there's been more efforts to move things into GCP.

Re:Alphabet Announces First Quarter 2022 Results by dijit on Tuesday April 26, 2022 @04:43PM (#31172906)
Afaik even “google cloud” itself runs atop Borg.
Re:Alphabet Announces First Quarter 2022 Results by jeffbee on Tuesday April 26, 2022 @05:15PM (#31173280)
Where else would it run?

G runs lots of small things on cloud but a company that is willing to fund 0.1% global efficiency efforts is never going to sacrifice far larger efficiency regressions just for the aesthetic pleasure of dogfooding cloud for major services like websearch.