If you RTFA, and even the headline, there is no problem here for the brewers, except for the one example in which the waste was sold to a broker. In this case the waste would be worth less so they might not be able to get any money, so the extra $30 might be amortized over the ton of beer. This, by my calculation would add a penny or two per beer.
So the problem is the farmer. If there is demand,and assuming that giving away the waste to a broker is cheaper than landfilling it, which in my experience it is, then there will be a marginal additional cost to the farmer. For the small farmer, who can just go to the brewery and collect the waste, the cost will just be transportation and labor. We used to do this for the cash crops we grew, collect waste, bring it to the farm, compost it, and use it for free.
For bigger operations, they will have to pay a broker and processor. This is a consequence of mass produced food. We have to have extra precautions because when something does happen, no one is really held responsible.