Many "open directories" are actually traps. Hackers set up fake "index of" pages that look like folders full of photos but actually contain .exe or .scr files disguised as images. Clicking one can infect your computer with ransomware or spyware.
The search usually looks like this: intitle:"index of" "DCIM" "hot" index of dcim hot
Accessing or appearing in these search results comes with heavy consequences: For the Uploader (The Victim): Many "open directories" are actually traps