Aspects of terrierwork have been banned. If you don't have the necessary permission, for example, it's banned.
Even pre ban if you didn't have permission it was illegal.
Due to the sort of people who become terriermen it's certain that illegal terrierwork is still being carried out. Carreg hides his forum from the public so that the members there can't openly incriminate themselves. Same goes for other hunting sites like huntinglife.
With the exception of Hunting life these forums have required that you become a member and log in to view the forum pre ban so it's hardly anything to do with incriminating ourselves, please don't think we are naive enough to think that there aren't members who are antis on our forums.
If a person uses his terriers to kill foxes he's a terrierman. Every single person convicted of badger-related offences during the last 20 years has been a terrierman. Same goes for dog-fighting.
I fail to see your point even if that information is correct, not all terriermen or women are dog fighters and the majority work their terriers within the law, however flawed it maybe.