Dark data is the information companies collect but never use, often making up...

https://xeon-wiki.win/index.php/How_Does_Dark_Data_Increase_Inferencing_Costs_and_Token_Usage%3F

Dark data is the information companies collect but never use, often making up 60-80% of their stored data. This hidden, inactive data can quietly drain storage resources and cost businesses up to $2.5 million a year