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
I'm not usually one to criticize YouTube but a) Why shift focus on such a little mostly insignificant number when there are copyright issues and demonetisation still going? b) May be a good idea, but I suggest having some sort of arrow where you can see the exact sub count.