@profdc9 @gp Regulators don't need in-depth investigations to determine whether, say, Zuck has provided his ex-users with the files needed to redirect their social graph to a new host. If a user claims not to have received this doc, the regulator can just order FB to escrow a copy with the regulator, which then passes it onto the user.
This is an enforcement system that 10 people could manage, while managing all of FB's 4 billion users.