Mobile is actually a great platform to get Hugh resolution, since you can zoom in really easily and navigate the full image.
However, after spending 10 minutes on mobile this morning, I was unable to find any high resolution images, and many images had that anti-pattern of a BS HTML gallery that severely restricts interacting with the image.
Past a certain resolution, mobile devices automatically scale down images. This is hard to see in real-world images like pictures/galaxies. But try to open a really large image with some text in it and you will surely see how the text has turned blurry
However, after spending 10 minutes on mobile this morning, I was unable to find any high resolution images, and many images had that anti-pattern of a BS HTML gallery that severely restricts interacting with the image.