I may have missed something, but why are Kraken doing this exactly?
You haven't missed anything,
they aren't doing it, at least not honouring entire claims. Title is misleading.
What they are doing, is handling reimbursement of the 200K BTC that was "found". I.e. users may get back ~20% of their funds.
Even they are only handling the distribution of "found" coins, that still requires investing certain amount of resources and efforts. I applause some one is taking up this responsibility.