Fandom pages are incredibly obnoxious with how many ads they load, making them bloated and difficult to read for profit
Fandom bought Gamepedia and FORCED all the Gamepedia wikis to switch to the Fandom format, which has a bunch of ugly UI shit literally nobody likes or uses
Fandom tries to impede any attempt by users to migrate to a better hosting service, banning anyone it sees as promoting alternative wiki sites
TL;DR: it's basically Enshittification: the Company.