I was wrong the people responsible for the craze is Forbes:
Rise in popularity
Google Search popularity of fidget spinners in early 2017.
On December 23, 2016, James Plafke of Forbes published an article describing fidget spinners as the "must-have office toy for 2017." In late March, users on social media websites such as YouTube and Reddit began uploading videos reviewing and performing tricks with fidget spinners. The Boston Globe reported that fidget toys in general "entered the mainstream" with the related Fidget Cube toy also rising in popularity. Several sellers on Etsy were reported to be creating and selling customized spinner designs.
It's from Wikipedia.