This is everyone's story with these words. This movement was not driven by POC taking issue with the word "blacklist". It started with some white dude's shower thought that because "blacklist" was a negative thing, and because "black" also can refer to skin color, that the term was thus racist [1]. Then a bunch of other white dudes ([2]) were like "oh yeah for sure that makes so much sense" and here we are--everyone goes along with it because they (rather patronizingly) think that someone else will be offended.
The word "blacklist" is many hundreds of years old. It does not have a racial origin. It's just a word. Nobody actually makes the association between "blacklist" and "black people" unless you tell them to! Our brains aren't nearly so stupid!
[1] https://twitter.com/andrestaltz/status/1030200563802230786 [2] https://twitter.com/dhh/status/1032050325513940992