I once worked for an MSP that would reuse decommissioned storage for other customers and services.
Tried to convince them to stop, and even setup a service on lunch breaks to attempt and sanitise them using open guidelines available at that time - an automated service that would display drive sanitisation status on a text based panel next to a multi disk bay caddy in the storage room.
I resigned because of this, and many other similar business practices - all just to make more money (it was not malicious otherwise).
The business is rather successful to this day. I only hope they have stopped such activities.
And yet I still lose sleep about this..