Google has weird rules and inconsistent indexing. I recently published a two-part article on using graphql/apollo with react and rails; it never indexed the first part (the graphql / rails bit) but did index the second part (react and apollo). And in fact, searching for with "graphql rails react apollo" still doesn't show any results for this page on google despite ostensibly being indexed, but it shows up on duckduckgo. And looking over the results on google, only ~4 are actually relevant to the topic, so it's not like good content is being shown.