multiple lawyer friends I know are using chatgpt (and custom gptees) for contract reviews. They upload some guidelines as knowledge, then upload any new contract for validation. Allegedly replaces hours of reading. This is a large portion of the work, in some cases. Some of them also use it to debate a contract, to see if there's anything they overlooked or to find loopholes. LLMs are extremely good at that kind of constrained creativity mode where they _have_ to produce something (they suck at saying "I dont know" or "no"), so I guess it works as sort of a "second brain" of sorts, for those too.
There's even reported cases of entire legislations being written with LLMs already [1]. I'm sure there's thousands more we haven't heard about - the same way researchers are writing papers w/ LLMs w/o disclosing it
[1] https://olhardigital.com.br/2023/12/05/pro/lei-escrita-pelo-...