Anyone that organises an activity becomes responsible for its operation. Angelflight is the responsible organisation in this case as they arranged the service between the public member and private pilot. They then hold the duty of care to ensure the service is safe and adequate. Whether you make profit or not matters nowt, like sayimg UBER is not responsible for its drivers.
By the way the ATSB basically said the same thing, so you might be out of step with reality.