PDF export function with the selection of which metadata or whether general metadata of pictures should be exported.
Many companies and also designers are not aware that they share sensitive content on their websites via the metadata for expamle in pictures, if these were uploaded directly after the InDesign PDF Export.
Many PDFs created with InDesign that you can find online from large companies contain very accurate, detailed information such as mails/phone numbers/patient information/non-public addresses/etc (for example Metadatas from Images embedded wihtin the exported PDF). This is a privacy conflict and in some countries a violation of existing laws.
Photoshop/Lightroom/Premiere, for example, use a check box/features to control the metadata that is exported. In InDesign this feature is missing.