Why are brass catchers or bullet casing catching nets banned in

Anyone have experience with AR-15 brass catchers? - The Firing Line Forums

CED Brass Chute / Brass Collector

ESN Gadgets - Pistol Brass Catcher

Softs or Solids Larry's Short Stories

Ten Innings at Wrigley

Small Bullet Catch - Lee Valley Tools

Why are brass catchers or bullet casing catching nets banned in NSW, Australia? - Quora

Universal Brass Catcher in an Ammo Can & Gun Box Systems for the Shooting Sports Community of 21st Century

Why are brass catchers or bullet casing catching nets banned in NSW, Australia? - Quora