Every winter, without ever being asked, my neighbor plows my road for me. I give him a jug of his favorite whiskey. I guess that could be construed as illegal even though there is no agreement between us to do this. I figure he paid tax when he bought the tractor and fuel and I paid taxes when I bought the R&R, and every year the property taxes. The only thing not getting taxed is our friendship and time.
There are a number of things that are technically against a law or regulation. In my opinion, if they occur on your private property and no one is harmed or complains (meaning that no one knows or care) then... who cares?