Keybase absolutely MUST implement a "we haven't received any FISO requests, etc." type of page on their website, one which can be taken down in the event of an

Keybase absolutely MUST implement a "we haven't received any FISO requests, etc." type of page on their website, one which can be taken down in the event of an illegal intrusion by the government via this mechanism, before it's too late. One cannot add a page stating that they have had such a request, so the former is the only option.