There are not enough consumers to care? Or maybe with legislation we get better outcomes due to scaling effects?
If we are willing to use legislation, could we tax such gestation crates, and use that tax revenue to breed unconscious pigs? Or find a way to disable consciousness in their brain? Or fund lab meat? I'm sure small labs are doing this, but if we are at the point of legislation, I imagine there is enough willpower to solve this problem rather than bandaids.