No, but lab and farm animals are typically slaughtered after around a year, so they don't generally have to worry about long-term effects of smaller housing on them. Various studies have shown that the stress of living in too small areas in social animals can take a toll on health after many years. Your average pet owner generally aims to have their rabbits for 10 years or more. The AWI is NOT a bad organization, and their research is NOT false (I never said that it was). But the two categories of animals are extremely different and have different considerations, and the two organizations hope to achieve and entirely different goal.
It's kind of like people in dorm rooms -- most people would be fine sharing a dorm room for a few years when they went to college, but would probably go nuts if they had to live there for 10+ years.
I never called you an animal abuser, and I certainly don't think you are. Unfortunately, I can't relieve you of your paranoia about the house rabbit folks. I'm not sure what they would have to gain by "manipulating facts to support their claims". They're a nonprofit organization that doesn't even sell rabbit products. Whether you keep your rabbit in a mansion or in a 1'x1'x1' cage, it doesn't really affect them at all. But it does affect your rabbits.
I can only speak from my personal experience, which matches what they say overall. I don't agree with every single thing on their site, but I agree with the majority of it. I've got two senior rabbits, and they're staying in a 13 square foot cage, which is enormous. But when I got in litterboxes, toys, etc, I really felt like it wasn't big enough. They free roam a room in our house throughout the day now, with access to their cage at all times. But I would still have a hard time imagining 4 rabbits ranging that room, because it would seem very cramped.
At any rate, I was simply offering advice based on what I've read, what I've personally observed, and based on the people I know with 4+ rabbits living in big warrens. Good luck with your new bunnies.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry