According to @TeamYouTube, the abbreviated subscriber counts will be rolling out to YouTube and YouTube Data API starting September 10th, 2019.
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Replying to @iakshatmittal @TeamYouTube
what is abbreviated subscriber count?
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Example: PewDiePie- 101,332,556 PewDiePie- 101M - Abbreviated
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Thank you 
9:21 PM - 14 Sep 2019
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