Is running a bootleg version of Xenforo a violation?

[FutureGenerations]

I am well aware that some websites (ex. KiwiFarms) has been running bootleg versions of Xenforo after the license agreement was terminated in 2021 for violating their Terms of Service and I was wondering out of curiosity if there may be any repercussions towards KiwiFarms and any other websites running bootleg versions of the Xenforo.
Is running a bootleg version of Xenforo a violation?

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