I was thinking it was sync, but I didn’t want to call them out if I was wrong…
I suspect that it was originally written for devices with much less power and much less memory. Also reddit had upper limits on image size. So, Lemmy’s yolo way of dealing with images is coming up against sync’s attempts to be able to run nicely on the worst devices.
I think you are grossly overestimating the audience of this author. They are a “self published” author whose books are free and not read by many people.
If anything, she will see a massive spike in readers just because of curious people checking her out.