It'd be very interesting to run the same experiment except rather than on different engines, just on different versions of Google in different years. Sadly I can't really search 2005 Google anymore of course but it would be interesting nonetheless to see if it's Google in general or rather the recent "enshittification" of their results. It may be intriguing to expand to survey takers outside of Reddit to get a potentially less biased set of results, yes.
Wonder if you could reconstruct synthetic versions of Gsearch with archive pages. I'd guess SEO/SEM companies have the data to build a small version of this and track the changes over time.
