That isn't what is happening in either the original bug for the Google Pixel Markup tool or this bug in the Windows Snipping Tool. What is happening is that the

That isn't what is happening in either the original bug for the Google Pixel Markup tool or this bug in the Windows Snipping Tool. What is happening is that the software is overwriting the original image with the new one, but not truncating the file, so if the new compressed image data is smaller than the old, the remainder of the old image still exists at the end of the file. This data is not made available to the user to uncrop the data at a later time, so it provides no benefit to the user, just risk of privacy violations.