For large organization data the keys would need to be stored within the organization, not with one particular user as in the case of your personal PII needs.
And then you'd still need to worry about digital sovereignity for the keys.
I don't follow. Are you saying that BigCorp would demand key escrow? They already deploy custom email solutions today so I don't see the issue.
I don't follow. Are you saying that BigCorp would demand key escrow? They already deploy custom email solutions today so I don't see the issue.