Who started “Signal after WhatsApp's privacy update”?

@mikebutcher, on X, Jan 6, 2021. It reached 4 platforms in 5 months.

LineageKey steps, 12 of 16. Lines follow time and platform
WhatsAppBefore the first post@mikebutcherFirst postElon MuskXPressOwner responsePlatform jumpCommercialOwner responsePlatform jumpPeak proxyPressAfterlifePatient zero