If Google were to have the astoundingly poor business sense to secretly allow payment for higher 'organic' search rankings: they'd hopefully at least have the good sense to not blow that secret on a fish as small as Fandom.
a relative of mine worked for a company who were explicitly paying Google for higher "organic" search results
How so? Fandom seems to have Google ads. We wouldn't be able to prove if Google ranked sites with their ads higher. Google's search ranking is black box. Edit: I guess at great effort you could scrape thousands of sites, not if they remove or add Google ads, and track their rating.
I think it is a better assumption to make, that Google puts their profit above luser experience, when it comes to search ranking.