> That's ignoring how video game wikis are used. People will google "<game> <place where I'm stuck>" and completely miss the wiki. Or "<game> <mechanic>". Etc. So reachability and proper indexing by search engines is a must.

Well, it's a "must" because over the years people have been trained to do this, instead of going directly to a quality website they trust. However, this has also trained website owners to neglect their brand and focus only on SEO, leading to the ad-infested wiki sites we have today.

Google went through all of this many (many) years ago with the "content farm" problem, so this is nothing new, really.