I worked as a lawyer for six years; there are extremely strict ethical and legal restrictions around sharing privileged information.
https://aws.amazon.com/compliance/hipaa-eligible-services-re...
As you can see, there is much more than zero of them.
Most company's confidential information is already in their Gmail, or Office 365.
But Microsoft already got all the needed paperwork done to do these things, it isn't like this is some unsolved problem.
Nevertheless, the development of AI jurisprudence will be interesting.