I think symbolism has ended up confusing folks as well.
I don't see the tethered as 'twins' or 'clones' even though they look like the folks above ground. The rabbits got the idea of 'cloning' in mind. Ultimately I feel the rabbits were unneeded confusion. The 'down the rabbit hole' metaphor adds nothing to the overall film. You've achieved that metaphor already with the following:
Essentially the relationship is more mother and child.
The ones underground and the ones above are tethered to each other. The above feeds the below (Instead of food it's information). The tethered use scissors as weapons because it's what you use to cut an umbilical cord after birth. An umbilical cord ties the mother to the child. An umbilical cord is essentially a tunnel from the mother to the child. The film shows the mother and child relationship throughout but this is the case with the tethered as well.
All of that gets bogged down though when you introduce a physical place for the tethered, clothes worn underground which are similar to the ones above, the rabbits, the ones below behaving like the ones above, the red jumpsuits, the one glove on each hand, etc. So ultimately this ends up confusing people further.
What messes this idea up is the rabbits and tunnels + rabbits and cloning.
I feel there's a tighter movie in here somewhere. Like GoldenGlove above me said, it's the execution. I feel like too many ideas made the whole of this project feel clunky. Either go full supernatual/alternate/mirror dimension or don't. Don't show the audience the tethered live in a physical man-made place. If it's in the real world then people start asking real world questions.