"They were tasked with delivering 17 million pieces of mail that had been just thrown into hangers, that had been mouldy and a lot of the names on the letters were illegible," he said.

The inscription on her headstone had become so illegible that, prompted by a local campaign, masonry restorers were brought in to spruce it up.

There is an illegible history that you only really learn growing up in a place.

For example, personal information on a ticket stub could be replaced with illegible letters, or a private building exchanged for a fake building or other landscape features.

All other bullet points in the list of content limitations are photo-moderation rules addressing illegible or copyrights images.