Meanwhile I've personally found myself completely unable to take it seriously due to the subliminal messages being "marry and reproduce" and "consume". Like people need sinister brainwashing to fall in love, have sex, or engage in hedonistic consumption. These are base biological urges that have existed regardless of societal economy for millennia! By casting it as something from a sinister conspiracy it makes the creator come across as someone completely insane from being so swallowed by their ideology. The sheer ridiculousness of it it brings to mind the "Mortal Engines" series and its incredibly dumb basic premise and the critical panning that it received. The lesson being, that just because something is an allegory or metaphor doesn't prevent it from being so incredibly stupid that it completely derails the message it is trying to send. Imagine if the billboards instead said.
I recognize that this is certainly a minority view given how influential the film is. But I just plain cannot unsee it, like a Lovecraftian revelation and that ruins it for me from the start. Short of thinking Jodie Foster is talking to you through screens, it is very hard to look like an outright unhinged anti-Reaganist given the many legitimate things to object to about the man and his policies. Even if you agree with some of it, you can easily see where others would reasonably disagree. But this 'basic urges are part of a sinister conspiracy' sort of message? This managed to do it.