There is a business case - charge the FBI or any government agency for the cost of restoring/delivering it to them, or use the contents to improve any machine l

There is a business case - charge the FBI or any government agency for the cost of restoring/delivering it to them, or use the contents to improve any machine learning they are conducting, and I'm sure there are others. For the longest time Facebook couldn't actually delete photos that you requested the deletion of. They could remove it from indexes so it couldn't be found, but if you had the link it would still be available (akamai cdn). Because, to them, either the cost of the hosting was miniscule compared to the cost of writing the software to ensure things actually got purged from the CDN.