In a prior evolution of this, if you look into the Get Rich Quick marketing copy of the early 2000s (before SEO had taken over content formatting), you can see a parallel of sorts in those marketers doing human sales optimization Impact with bold and underline. It derives from research into the human response to ads from decades of print ads and centuries of printed matter prior, and I think there is a direct lineage from ‘how can we bias humans through restructuring text’ to ‘how can we bias machines through restructured text’. This isn’t to disagree, but to call out how rapidly humanity (merely twenty years!) has switched from marketing to people, to marketing to algorithms, in search of a favorable bias.