I wonder if they have access to information that could, at some point, be used for nefarious purposes beyond hounding you to death. Suppose you ever made a donation to the Worldwide Pedophile Defense Fund with a check or debit/credit card. Now, one day they have access to your checking account or card number and take it upon themselves to withdraw funds out of your account for the Worldwide Pedophile Defense Fund. Or, one day the hounder-hounder comes and does not like the drop in publishers, and attempts to pursue people under "breach of contract" clauses. The baptism may become viewed as a legally binding contract to give everything to them, which cannot be cancelled.
Or, perhaps some dingbat in the congregation has the stupid idea of pulling you back, regardless of how they have to do it. All they need is to contact one hounder that has access to this information, and from there it's only a matter of time before they strike. If the information would have been destroyed, that couldn't have happened unless the dingbat knew you personally. And, all it takes is for one little piece of "new light" from the Filthful and Disgraceful Slavebugger or a ruler in a country that allows them to pull the "legally binding contract" sxxx on one occasion, and these possibilities are very real. Again, it would have been impossible had the records been destroyed, save for that the person is disfellowshipped.