Beautiful but confused

Rating: 3/10 (22 March 2019)

The movie is beautifully shot, the storytelling is brilliant and the characters are likeable and stunningly acted... but the movie fell flat. The horror sequences are good and it avoids a lot of the cliches of the genre, but the ending is poor. Six million people (enough to join hands across America) are living in the sewers with access to clean boilers suits, an unlimited supply of rabbits and a pair of scissors each... yet no one knows, even though you can access one of their hideouts from a fairground ride.
In a flashback we see these subterranean clones mimicking the action of their counterparts on the surface. We see them being forced to endure fictional rollercoasters and waltzers. Then, suddenly this tie seems to have gone, the clones for an unexplained reason no longer copy those above them and without any means of written of verbal communication, all six million of them are able to plan a coordinated attack.
How would they even share a basic bit of information like the date and time of their uprising?
It's also hard to understand how their underground world worked, when the young girl one a t-shirt in the fairground, her clone underground received the same t-shirt. Do these items spontaneously appear? If so, why are they forced to eat raw rabbit? Does food not spontaneously appear too?