the use case i "feel" these are useful are for studying any given topic. having one single page helps avoid many google searches, tangential questions, etc., but i'm always looking out for inaccuracies.
"no competition" i guess you meant this figuratively. But in fact there is a ton of competition and the point of the article is that G is suppressing that competition by unfairly giving themselves the space which needs the least number of clicks to reach.