I don't know if it is like here but a lot of river access is just messy. Now lakes and ponds are fairly clean. I guess it may be the lack of enforcement because its rare to get licenses checked on river. Probably because game wardens don't want to track on foot.
Its not very common here unless you find a German restaurant. Not too many of them here. There use to be one close to my work place I would visit occasionally but it closed down 😔