re: Instagram Star, Bianca Devins, murdered - pics of crime posted on social by bf

Because that's just not how it works. It's not as if there's only one photo, or one set of photos, and that one thing is being shared.

Each new upload is a new photo, with a new id, new hash, new everything. The whole point of instagram is people posting photos, that combined with the scale of ig means there's no blanket solution besides perhaps training an AI and scanning every single upload to search for that photo, which would make the service awful for everyone and be incredibly expensive.