It would be interesting to know how the Danish government views the Roman Catholic Church's internal legal system. It has such a large body of "canon law," that is, a set of rules/laws which comprise "a parallel legal system" within their religion that certain priests spend their entire careers studying canon law. I know one such priest who works in the diocese of a city and is that city's expert on the church's "parallel legal system." Parish priests contact him for advice on how the church should deal with certain internal matters. We can say the same of Orthodox Jews and rabbinic law. Both of these religions have been around a lot longer than the WTS.
It is interesting that the Danish government is apparently focusing on JWs in this matter. This must be due to ex-JW activism. The RC church and Orthodox Judaism there have no such movements.