Who is "the Sponsor" in this?

Even if they act in good faith picking the correct chain, I'm missing details on what happens to the value in a possible Fork chain. When the BCH Fork happened, the value of the Forkcoin varied, but could have been sold for 10-20% of the Bitcoin value. If they keep that instead of sharing it with the ETF investors, it just adds to the list of reasons to keep your own keys.