You can pinch-zoom on mobile, but only while you're holding it down. I suspect again this is intentional and the two go together - they don't want you zooming in on limited resolution images, that'll look even worse.
This is a relatively recent feature. And yes, it is almost certainly because the images are awful quality before zooming in, so they want to limit how obvious this is.
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Par for the course, really. Still can't zoom into images on Instagram, can you?
The one and only supported image resolution is also lower than any of the screens I use.
The app is really hard to believe from a technical perspective, in general.
You can pinch-zoom on mobile, but only while you're holding it down. I suspect again this is intentional and the two go together - they don't want you zooming in on limited resolution images, that'll look even worse.
This is a relatively recent feature. And yes, it is almost certainly because the images are awful quality before zooming in, so they want to limit how obvious this is.