Duplication glitches, commonly known as dupes, are glitches or bugs in the game or 2b2t itself that allows a player the ability to duplicate an item.

Is duping cheating Minecraft?

Duping is considered cheating and can get you banned on multiplayer servers. Most of them usually patched these dupes using Third-Party plugins.

Is duping illegal?

Again, duping or exploiting duplicate bugs are illegal. Instead of using a glitch to your benefit, report it to the developers and help make a better gaming experience for everyone.