Fandom was formerly known as Wikia, the commercial platform launched by Jimmy Wales. This wiki (along with many others) was launched long before the Fandom name.

yeah i don't know why they switched everything from wikia to fandom i think it was a bad call.

Wikia still exists... for example https://googology.wikia.org/wiki/Googology_Wiki is a fun one to lose an afternoon to.

And you thought Graham's number was big...

> Graham's number is commonly celebrated as the largest number ever used in a serious mathematical proof, although much larger numbers have since claimed this title (such as TREE(3) and SCG(13)). The smallest Bowersism exceeding Graham's number is Corporal, and the smallest Saibianism exceeding Graham's number is Graatagold.

Wikia.org was created to house wikis that the maintainers did not wish to have their purpose tainted by the more corporate side(Fandom) of the company. So wikia.org handles wikis that are not about entertainment and more educational.