Haven’t watched the video, but pretty much fandom is just shady and a brutal user design. Have you tried using it on mobile? 90% of the screen is covered with ads. Even after you close them, the ads pop up again. They also embed streams from theur Twitch so they can inflate their viewers and make more money that way. Their website is shitty enough to waste even more web browser resources on that. They are greedy af.
To get an idea of a good unofficial wiki, take a look at the terraria one. It is clean, informative, decent navigation, and user friendly.