Sometimes the company cares more about not having access than the end user does. If you physically don't have the decryption keys, you can't get hacked and have user data leaked. You can also respond to government data requests with "Sorry we don't have access to that"
This. If you store a lot of sensitive documents, you also paint a target on your back. If you don’t even have the decryption keys, this angle becomes irrelevant.
