He’s been pretty careful to not do anything illegal (he’s talked about this in a few live-streams), for example not open-sourcing any of his control software and using just local IMU data for in-flight control.
(Not "go to jail" bad, but "The New Zealand government has moved aggressively to shut down this project -- and by using quite unscrupulous methods which appear to be in breach of the law." type of bad...)
You would be surprised, that most acts of aggression do not have months of planning and 1M+ engineering budgets. Remember the most "special" tooling the 9/11 terrorists had was some cash plus basic flight training.