Minecraft anarchy server items?

Hi! In many minecraft anarchy servers you see people with infinite items of which one is very rare. How does it work? With which glitches / hacks can you get items?

Xray and Automine are your friend. A good hacking client and knowledge of hacking and scamming - and the inventory fills up.

Either they have been playing for a long time and have participated in the different dupes where items can be duped (the glitches are patched pretty quickly) or they have worked their way through a lot of grinding (which is the case)