Abbreviated public subscriber counts are gradually rolling out starting next week. We heard a lot of feedback from the community following our announcement in May – we’ve updated our original post with more info here → https://yt.be/help/LF4J
I don't know where this 'feedback' has come from, because practically all of the tweets directed at this would much prefer to have the subcounts public. It's useful to streamers who want to share their subcounts live and for socialblade, etc. Would be better as being optional.