Alt text: a picture of Spider-Man looking at a wall with the caption, “Everywhere I go, I see his face”. On the wall is a picture of the profile page for Lemmy user the_picard_maneuver.
That might be it. On top of not federating images, I know that Lemm.ee has file size restrictions for its users too (to reduce load and keep things fast, I think), so maybe there's something related to that as well.