I tried to test this by searching Google.com versus Google Australia. I haven't seen much difference, myself. Even without RankBrain, results would often be different this way simply because of the "old fashioned" ways of favoring pages from known Australian sites to searchers using Google Australia. Does RankBrain Really Help? Although my two examples above are far from convincing in terms of demonstrating the greatness of RankBrain, I really think it probably has a big impact, as Google claims.
The company is quite careful with what goes into its ranking algorithm. He does little tests all the time. But he only initiates big changes when he has great fax number list confidence. The integration of RankBrain, as it's supposed to be the third most important signal, is a huge change. I don't think Google would do that unless they really think it helps. When did RankBrain start? Google told us that there was a gradual rollout of RankBrain in early 2015 and it has been fully operational and global for a few months now.
What queries are affected? In October 2015, Google told Bloomberg that a "very large portion" of the 15 percent of queries it normally never sees before are served by RankBrain. In short, 15% or less. In June 2016, it became known that RankBrain was used for every query processed by Google. See our story about it: Google uses RankBrain for every search, influences the ranking of "many" of them Is RankBrain still learning?