In Denmark roughly 100% of the chicken is halal, but it is illegal to slaughter the animals by cutting of their head without sedating them, so in practice the only thing that changes is some imam saying an islamic prayer over the chickens.

Of course, that is too expensive, so now there is a recording of an islamic prayer over a loudspeaker.

Which is also the problem I had with the article: his rule only works when complying with the minority is cheap (playing a recording), if a halal chicken also had to have decent living standards making it 4 times as expensive, there would be a lot fewer halal chickens.