Why YSK: Because fandom's website is complete garbage, it's filled with ads, has a horrible UI and has auto playing videos for no reason. For some reason a lot of game wikis still use that website.
Believe it or not, it's the same guy that made Wikipedia. Apparently he was sad he couldn't monetize it, so went ahead and made the cancer that is fandom.
Disclaimer, this is something I've read on different threads on reddit, so take it with a pinch of salt.