Why doesn't 'fetch' image work sometimes?

The Smiling Pony
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Magnificence - Artist with 100+ Safe/Suggestive images with over 100 upvotes, and 5+ Questionable/Explicit images with over 350 upvotes
My Little Pony - 1992 Edition
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
The Power of Love - Given to a publicly verified artist with an image under their artist’s tag that has reached 1000 upvotes
Dream Come True! - Participated in the MLP 9th Anniversary Event

Manually Breathing
@Stammis
Because DeviantArt is a bad website.

More specifically in this case, DA requires a user to be logged in to be able to access any image flagged as "mature". As this site isn't a "user", DA tells the image grabber to pound sand despite its purported oembed support.
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