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"Powered by Google" makes sense in Google Apps, which offers white-label versions of Google's consumer services, but it feels out of place in a regular Google service.
Google also uses "powered by Google" for custom search engines, "powered by Google Translate" for Google Translate gadgets, "powered by Google Drive" for forms, "powered by Google App Engine" for App Engine sites, "powered by Blogger" for Blogger blogs, "powered by Google Sites" for sites created using Google Sites. These attribution messages are displayed for pages, gadgets, sites created using Google's technology.
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{ Thanks, PhistucK. }