You are not what you read: librarians purge user data to protect privacy
theguardian.com
theguardian.com
It also seems obvious that voluntarily deleting data is unlikely because data is an asset. Regulation seems unlikely to be forthcoming because governments want their own access to corporate data to persist.
What's not obvious is how to approach the issue.
The irony that librarians - government employees - actually recognize the real threat and protect their customers is why the library remains the only government institution I support.