This is especially true for comments that disagree with Googlers, likely because there are soooo many Googlers now and they (and Waymo) have highly aligned perspectives. Especially on Google-launch-related posts, 5-10 point swings in 24hrs can happen.

A good piece by an ex-Googler on his 2-year journey toward recognizing the scale of institutional thought at Google: https://mtlynch.io/why-i-quit-google/