much of the non-commercial camp grounds in NSW is governed by NSW National Parks and Wildlife service (NPWS) authority which includes the 800-plus national parks and conservation areas and ALL campgrounds in NSW national parks
require a booking, even the free camps which exist within some National Parks require a booking, and all free campgrounds now have a non-refundable $6 booking fee - see
https://www.visitnsw.com/things-to-do/caravan-and-camping/free-camping-nsw