I am speculating, an impact this size must be related to a change in Google search ranking. Although there appears to be a Monica effect (2020) in the data too

I am speculating, an impact this size must be related to a change in Google search ranking. Although there appears to be a Monica effect (2020) in the data too. I stopped contributing myself around that time: https://meta.stackexchange.com/questions/340906/update-an-agreement-with-monica-cellio https://meta.stackexchange.com/questions/340906/update-an-ag...