[whywhywhywhy]

I think the urls might be specific to your session in some cases. I’ve noticed some old IG posts I’ve put in bookmarking services say they’re expired.

So passing to yt-dlp would be traceable back to me in that case.

Definitely wasn’t cookies that’s what surprised me.

[tecleandor]

Ah OK, I was thinking about youtube, I re-read it and saw noticed you were talking IG. Yeah, I've noticed some IG URLs are suspicious: different from other users or opening related info that it shouldn't be there.