10sqft per chicken isn't excessive imo, especially if the birds don't free range or have a large enough run. If they're spending most/all of their time in their coop, bigger is of course better.Actually , most prefabs are 1 or 2 square feet per bird, the minimum often quoted here is 4 sq feet. 10 feet is excessive and this is not something we want the government to give two hoots about. I don't want them to regulate anything to do with my birds, personally.
4sqft per bird I think is fine as long as they don't spend much time in the coop.
The appropriate coop size is circumstantial but 4sqft per bird should be the minimum that's allowed to be advertised and sold.
I don't think the government should have anything to do with it, but reputable animal welfare and other such organizations should have more of a say in what's allowed to be sold.
I cringe every time I see a fish in a bowl, for example. Why get an animal just to torture it? Unfortunately most people just aren't aware of how fish should be kept. They're (relatively) cheap and replaceable so just pop a goldfish in a bowl for your kid and spend 2 bucks on a new one when that one dies within the month. Proper goldfish care requires 100 gallons per fish. Might seem excessive to anyone who doesn't know or care about fish keeping, but they grow very large and live very long lives when properly cared for.