That's not how the timeline of the article reads. The prison was the last resort after the other suppliers went out of business. From the article, it says they

That's not how the timeline of the article reads. The prison was the last resort after the other suppliers went out of business. From the article, it says they were weeks away from no cheese at all. The prison specifically stepped up the market demand. They didn't push other's out of the market. Haystack is paying market price for the milk. They are paying full value for the milk and they aren't paying the labor costs of the prisoners. They are buying milk.