If they say they don’t want you doing it. Then it shouldn’t surprise anyone that they call you out if you do. As a government agency, their regulations have full force of law. Look it up if you want. Even though they are not called laws. Same with national parks services.
But, as I always say, you can do whatever you want at your own peril. I enjoy the reading
regulations
n. rules and administrative codes issued by governmental agencies at all levels, municipal, county, state and federal. Although they are not laws, regulations have the force of law, since they are adopted under authority granted by statutes, and often include penalties for violations. One problem is that regulations are not generally included in volumes containing state statutes or federal laws but often must be obtained from the agency or located in volumes in law libraries and not widely distributed. The regulation-making process involves hearings, publication in governmental journals which supposedly give public notice, and adoption by the agency. The process is best known to industries and special interests concerned with the subject matter, but only occasionally to the general public. Federal regulations are adopted in the manner designated in the Administrative Procedure Act (A.P.A.) and states usually have similar procedures.