Does this mean anyone doing Field Services are doing so with no backing from WTS?
Absolutely. Watchtower has repeatedly stated that the ministry is purely an individuals own affair. In the recent case of a leaflet left on the gravestone of someone’s dead son, watchtower again maintained it was nothing to do with them and an individuals ministry is purely their own affair. They insist JWs pay for their own insurance or permits for some types of public witnessing, too.
They point to Jesus’ great commission in Mathew 28 to all his followers to go forth, preach the good news and baptise etc. It’s a commission between Jesus and each individual Christian. But really it’s just an excuse to get watchtower out of any legal trouble.
Thing is, like the goat owners, organizations and people have a reasonable duty of care to others. We all do. Which is why the CSA cases have been successful.