This is probably super obvious to most of you but this may be the first time I've heard Google comment about this. Amazon has this Alexa rank feature, they had it since like 1996, a super long time. Google's John Mueller was asked if Google uses it for ranking sites and he obviously said no.
This is at Alexa.com, not to be confused with Amazon Alexa digital assistants, but owned by the same company.
Here are the tweets: