Who are these providers that just delete client data? I run a small datacenter for our niche of clients and when the contract terminates or the project is finis

Who are these providers that just delete client data? I run a small datacenter for our niche of clients and when the contract terminates or the project is finished I box up all their data and fire it off to S3. Storage is so cheap these days there is no excuse not to keep client data for at least a month.