Yes, it is a hacked client, that's the entire point, when people accuse others on servers of "hacking" what they're actually using is a hacked client which gives them access to things that you normally can't do like kill aura, speed, etc. on most servers these are disallowed because they give you an unfair advantage but 2b2t is an anarchy server so they let you. To install a hacked client you need a purchased copy of minecraft and many require minecraft forge as well (such as the impact client), hacked clients aren't standalone free versions of the game, you're probably thinking of cracked minecraft in that regard.
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Yes, it is a hacked client, that's the entire point, when people accuse others on servers of "hacking" what they're actually using is a hacked client which gives them access to things that you normally can't do like kill aura, speed, etc. on most servers these are disallowed because they give you an unfair advantage but 2b2t is an anarchy server so they let you. To install a hacked client you need a purchased copy of minecraft and many require minecraft forge as well (such as the impact client), hacked clients aren't standalone free versions of the game, you're probably thinking of cracked minecraft in that regard.