I'd be looking into why everyone is having frequent recurrence of bumble foot in their flocks and trying to prevent it...it's just not normal to have such things going on all the time. I've been keeping chickens off and on for 40 yrs now and never had bumble foot in the flocks. They all have high roosts made of natural limbs, are heavy breed birds, walk on gravel quite frequently, free range all the time in all kinds of terrain and have never had such a thing. I think all the things they blame this bumblefoot on can't be the reason for them as my flocks are exposed to them all...except the following reason.
One thing I have seen listed as a cause of bumblefoot in other types of birds people keep as pets was a rich diet high in proteins, along with other factors such as obesity, low activity levels, etc. But I never see that mentioned on this forum as a possible cause, even though each year I notice the levels of proteins being fed out there in the BYC crowd just increases and increases, particularly during molt and during the winter months~both seasons when activity levels are lowest in a typical coop and run situation. Also a growing trend is "treat" feeding, the more elaborate the better.
The reason I fail to believe it could be caused by injury and then an infection is that often in these descriptions both feet are affected and one post describes most of a whole flock afflicted with bumblefoot. It's just really unlikely that a large number of birds in a flock just happened to get foot injuries that result in infections...one bird in one foot maybe, but many birds and often in both feet would indicate a problem that affects the whole flock and may be more likely a nutritional problem.
In light of that, was wondering if y'all were maybe feeding too rich a diet to birds that are less active than they should be? The one pic showed nails that were hugely overgrown for a chicken, indicating this bird is not using them for scratching for food much, if at all, nor putting many miles on those feet.
Just throwing that out there as a consideration. Until I joined BYC I never really heard of many cases of bumblefoot in chickens though I come from generations of flock owners and had heard of it in waterfowl before...usually just in one foot and usually resolved by a change in diet...but was pretty amazed to find so many people having that issue here and it seems to be increasingly prevalent in these small, backyard flocks nowadays.