i haven't found a post about this, but i haven't looked very hard, so sorry if this was discussed before.
this concerns people posting reviews with photos, especially of bulk amounts, and of course vendors with market listings that feature product photos (although i figure most of the latter know about this).
even if you strip the exif data, all of your photos can be proven to be shot with the same camera. this is done by looking at hot (=defective) pixels, noise, and dust on the sensor. there is no way to effectively guard against this because even when you crop and rotate a picture the size ratios, distances and angles between defects from hot pixels, noise, and dust stay the same.
if you feel you need to post potentially incriminating photos, do so with a camera that you use exclusively for this purpose, and be aware that this camera in LE's hands will put you in the same room with the illicit goods photographed with it. vendors changing their virtual identities to avoid heat from LE should switch to a new camera together with their new nickname as to avoid leaving a forensic connection between the separate monikers.
On a sidenote this can also be used by the community to identify new accounts of known scammers if they keep using the same camera.
stay safe everyone.
This was discussed here few weeks ago. But thank you for reminding.