Totally discussing useless stuff here, but green and red to me give the feeling of temporary actions (and possibly alternating). Intuitively sounds more like slowing and speeding than it does permanently blocking or allowing something.

Black and white have the polar opposite meaning. At this point allowlist and blocklist might be a simpler solution to the "problem".

Yeah it's a problem with social media, twitter in particular. Nobody wants to put time into understanding any nuance, (and on twitter there's not enough characters to explain the nuance) so it's easier to jump to conclusions and go along with people that have jumped to conclusions because if you don't people will think you're on the "wrong side".