The only real way to confidently answer the question is to have before/ after pictures (with the before being either screenshots, or the same files on another device), and/or the image specs (formats, resolution etc.)
Having said that a few things could be happening here:
1. Pinterest could be compressing old pictures with limited interactions beyond a certain period. (Likely)
There’s enough online chatter which makes this the most likely explanation https://www.pinstagram.co/how-to-stop-pinterest-images-from-pixelating-2
2. It could be a poor sharpening/ upscaling algorithm as well. Displays 10 years ago often had significantly lower resolution, and maybe Pinterest has accepted low resolution images back then, and then tried to upscale these as required. (Unlikely)
3. You might just be misremembering (possibly a factor). I don’t think that’s the only reason here, but unless you’re looking at originals vs current images that’s probably a factor.
Edit P.S. – digital data doesn’t intrinsically “deteriorate” in a manner that results in glitches/ fading like your examples. Storage crashes happen often, but those result in just losing the images/ the files becoming unreadable. Unless you’re trying to recover data from a crashed device with some specialised programs, you won’t see in-image glitches/ artefacts (and rarely in images even then).
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