Heads up, Creators: On Dec 13-14 you may see a noticeable decrease in your sub count as we remove spam subscriptions. If spam is removed, you'll see a YouTube Studio alert: https://goo.gl/qGDBvX This should help give you confidence that the subs you do have are real fans!
"Why not get rid of channels that promote the crap" I don't know if there is a second tweet to continue this but this was phrased in a funny way.