I'm only pointing out you'll get better results today, in all browser, by upscaling offline and then letting the browser downscale than upscale in the browser via `image-rendering: pixelated`
The question was "Why are they using image that's been upscaled offline" and I have a reasonable explanation why someone might want to do that.
The question was "Why are they using image that's been upscaled offline" and I have a reasonable explanation why someone might want to do that.
TL,DR; because it looks better across devices.