FWIW laws like that are not enforced in Germany by public regulators but by competitors and associations sending out endless of the infamous costly cease-and-de

FWIW laws like that are not enforced in Germany by public regulators but by competitors and associations sending out endless of the infamous costly cease-and-desist letters ("Abmahnung"). So just one competitor (or business/consumer association) with enough will and money to fight that question through courts will be enough to settle such questions. Happens all the time with consumer protection laws. There is a large industry of lawyers for both sides. Your online shop says it offers "insured shipping"? Cease-and-desist letter in your mailbox next day. You don't give a price per unit (kg, l, etc.)? Cease-and desist. Send the required information on the mandatory 14 day return period in the email body instead of a PDF attachment? Cease-and-desist. Don't comply to just one of the other ever changing consumer protections laws? Cease-and-desist.