Recreating a person from haphazard data would almost certainly be impossible without a FAI, and with FAI you don't need to make wishes, it knows better whether you should've wished something or not.
This is probably true, though there's still the possibility of e.g. the FAI having low confidence of what I'd have wished, and the values of the population being such that it chooses to err on the side of not making copies when there's uncertainty. Not the scenario I'd assign a terribly high probability on, but then explicitly giving permission also only took some minutes or so.
Giulio Prisco made a blog post giving permission to use the data in his Gmail account to reconstruct an uploaded copy of him.
Ben Goertzel copied the post and gave the same permission on his own blog. I made some substantial changes, such as adding a caveat to exclude the possibility of torture worlds (unlikely I know, but can't hurt), and likewise gave permission in my blog. Anders Sandberg comments on the thing.