Gentoo's policy identifies three points that prompted the decision: copyright, quality, and ethical concerns. Code quality is almost self-explanatory: these tools often produce extremely poor quality code. Firstly, no project wants to include bad code. Secondly, nobody really wants contributions from programmers who aren't able to identify poor-quality code, or who are unable to write better themselves - or at least to improve the bot's efforts.
LLM stands for Large Language Model and these tools work by building statistical models of extremely large 'corpuses' of text: vast collections of terabytes of text (and imagery, for the graphical tools). The tools automatically build unimaginably vast models of which words appear with which other words, how close to them, in what sequence and in what permutation.
"AI assistants", and "generative AI" in general, are not intelligent. The clue here is that industry itself has invented a new term for its attempts at computer intelligence: in recent years the companies behind LLMs now term that AGI, or Artificial General Intelligence.
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