Currently, public sub counts are abbreviated in most but not all places across YouTube. In August, we’ll make this more consistent by always showing abbreviated sub counts publicly. Creators: You’ll still see your full sub count in Studio! Learn more → http://yt.be/help/abbrev-count …pic.twitter.com/pmaKk4EU4k
As far as I’m aware the primary way YouTube makes money is providing a space for companies to place advertisements as well as generating data for ad placements and search history. Making things more difficult for content creators seems counterintuitive to that strategy.