The Overflow Blog, April 20, 2020
How the pandemic changed traffic trends from 400M visitors across 172 Stack Exchange sites.
I have a problem with one of the prepositions used in that statement, most noticeably "from". It feels that the sentence should end something like this: "traffic trends from 400M to 550M" Instead, the announcement is about the change in visitors' interests and participation across the SE network. Biology.SE and Puzzle.SE, to name but two, owing to the recent pandemic have witnessed a significant surge in numbers of posts and visits.
My quibble is with "from", would "by" have been incorrect?
How the pandemic changed traffic trends by 400M visitors across 172 Stack…
Chrome's online dictionary seems to confirm my impression: by “identifying the agent performing an action.”
Or would the following be clearer; stylistically better?
How 400M visitors from 172 Stack Exchange sites changed traffic trends during the pandemic…