I think Agfa threatened a major lawsuit which they'd have won, you can't pass a product off as something it isn't. You'll see J&C's packaging has the same colour scheme, pretty much the same Rodinal type face etc, I doubt Calbe were very impressed either. Then J&C also sold a lot of dodgy EFKE materials, essentially substandard with coating defects as well as miscut chinese LF films that wouldn't fit DDS. All in all not really a company you'd want to trade with.
John did seem influential for a while though, turning up at that APUG "conference" in Canada a few years ago.