You inspired me to do a bit more digging. I found the page on world population review.
https://worldpopulationreview.com/country-rankings/reddit-users-by-country
Which lists this site as the true source. Looks pretty legit to me. Seems to be a paid service.
https://www.semrush.com/website/reddit.com/overview/
They’ve got US traffic listed around 51% for December 2024, so it’s actually gone up significantly compared to the March 2023 figures cited by world population review
https://www.slideshare.net/slideshow/reddit-traffic-report-march-2023pdf/257621808
Went from 2.32 billion US visits in March 23 to 3.17 billion in December 24, while Indian visitors actually declined significantly in the same period.
Oh I thought it was a Dick Cheney joke, I guess that’s the American version though. It actually made perfect sense to me even without the double meaning.