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Curation is the action or process of selecting, organizing, and looking after the items in a collection or exhibition.

Google selects and organizes websites that comply with their ad infestation guidelines. Looking after them is arguable.

Doing something assumes intent. Like I told, Google doesn't have such intent, its intent is create positive feedback loops to increase its revenue.

A search engine with even the slightest hint of flavor by definition is a curation of the web.

They could create a positive loop if they wanted to.