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One message reads "Fandom does not allow wikis on topics that contain large amounts of sex, nudity and/or fetish material. Even if this wiki is kept "clean", we aren't hosting wikis about explicit content."

To be clear they are not censoring "explicit content". They already do that.
Their revised rule means they intend to purge even the memory of a things existence regardless of if the conversation is fit for preschoolers or not.
This is treated as being "safe" and welcoming to all.

"Wikis about sex, fetishes, and other pornographic subjects are not permitted even if described in a non-explicit way.”
"Fandom continues to monitor its communities and if necessary, will remove wikis that do not align with our policies. For example: hentai, sex-games, fetish wikis and other strongly sex-based content do not meet this revised criteria."

However they likely intend to keep hosting such content. If they plan to stick to their nondiscrimination of every globohomo newspeak out there they must.
Of course things like the Fifty Shades Of Grey Wiki and the Sexuality Wiki have no warnings of imminent destruction. Far as I know its only the anime media for now. The information on anime games, shows, books, ect...
Even then their choices seem arbitrary because the ever suppressed Interspecies Reviewers looks untouched by this.

While a few will cheer like always it's "another advance in the creeping infantilisation of the internet, in which every conceivable space must be "safe for children" and spaces for adults to discuss adult things are slowly suffocated out of existence, forced to retreat into ever-dodgier corners of the internet. To a large extent this is masterminded by the malevolent specter of the payment processors who can ultimately turn the lights off on any website they wish."

While the trend continues they will come for what you like sooner or later. We wouldnt be on this site if the state of things were otherwise.
Personally I prefer to live in a world where im not censored for saying poop. (Its happened before.)

A petition to oppose this censorship. At least for the Monster Girl franchise.
https://www.change.org/p/fandom-wiki-keep-monster-girl-encyclopedia-monster-girl-quest-other-fandom-wikis-w-sexual-content

Miraheze, a free, non-profit wiki-hosting service.
It is ad free and funded 100% by donations.
https://miraheze.org/

Articles about the same story.
https://archive.md/ebwv9
https://kotaku.com/monster-girl-encyclopedia-wiki-will-be-sacked-by-host-d-1848068972

https://archive.md/vI1Yu
https://www.vice.com/en/article/g5qgxb/community-dedicated-to-hot-monster-girls-deleted-for-fetish-material

Their Terms Of Use reads like a leftist lost their mind.
https://www.fandom.com/terms-of-use