Say you own a cow in Wisconsin. You board the cow on a private farm. You milk said cow and drink the milk yourself.
According to a Wisconsin judge, you're running a 'Dairy Farm' and have to follow all the rules and regulations (including all taxes, fees and licenses of course) because it's 'unsafe'. If you don't, you can be prosecuted.
But there's no slippery-slope to the Gov't overreaching it's authority and becoming a nanny. No. Not at all.