Google uses an algorythm to remember what kind of channels you like and to reccomend more of that kind.This algorythm affects search bar too, if you try it on private/incognito the result should differ.
That means you haven't looked at things starting with "gr".
If I type "C" into youtube, the first result is CaptainSparklez because I am subscribed and I watch him, and we both know there are things with "C" more famous and searched than that.
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