Dark data is the info companies collect but never use—like old files or logs....

https://front-wiki.win/index.php/How_Can_Dark_Data_Raise_AI_Token_Costs%3F

Dark data is the info companies collect but never use—like old files or logs. Up to 80% of stored data can be inactive, creating storage costs and security risks. It also clutters AI systems with useless noise, making insights harder to get