So I would expect, especially in a RankBrain world, Google will be making spam detection and search quality more machine learning based in the near future.

Google's machine learning helping it catch spam to Gmail Google has shed some light on why Gmail users should hardly ever see spam in their inbox, and almost never see wanted email in the spam folder.

Now, it's improving the process even further, thanks to its TensorFlow machine learning framework, which is blocking an extra 100 million spam messages every day.