I believe it's the result of the semi-random crystallization of the effective consensus about what word to use. Partly also what feels like "the next one after".
It's not really the job of facebook to do anything or care about anyone. It's on you and me to force them to do anything.
Don't get me wrong, I will absolutely blame the corporate apologists when shit goes bad. It's assholes like you that create an abusive environment for the rest of us. Your hands are soaked with blood.