Basically caged and kept solely to breed for profit. I don’t believe that is humane.
Profit? This friend/breeder hasn't restarted breeding since the ban was lifted almost 6yrs ago but used to charge c£600 for a pedigree kitten (this breed of kitten is now selling for upwards of £1,500 each). By the time all expenses were taken out, there was a 'profit' of about 10%, not exactly enough to live on when you're looking at maybe 4 or 5 kittens per litter.
Also, just because 2 male weren't allowed to live in the house, doesn't mean they didn't get massive amounts of love and attention, my friend had 5 queens and 2 sires (plus 9 kittens from 2 litters) at the time in question, had deposits from new kitten owners and had paid all vet's fees, feeding, care etc, then rspca took them all and wouldn't let the kittens go to those who'd paid, so friend also had to refund everyone, ended up over£20k out of pocket with fine, repaying deposits, vet's fees and value of their own cats.
And I'll say it again, they did nothing wrong!