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I don't know many who want to deal with untrustworthy people.
are we to somehow count the hypothetical future exploitees that may yet be helped by avoiding disclosure 1–1 against the actual literal current exploitees harmed by further postponing the fixes landing?
If you want your customers to believe they won't be hung out to dry when the broader community patches before they can because you're no longer in the loop, you cooperate.
It's not like this is the last 0-day that will need to get patched and deployed in a hurry. "Not slower to patch than virtually anyone else" is a pretty sustainable place to be.