I was literally just working on a directory of the most common tropes/tics/structures that LLMs use in their writing and thought it would be relevant to post here: https://tropes.fyi/
Very much inspired by Wikipedia's own efforts to curb AI contributions: https://en.wikipedia.org/wiki/Wikipedia:Signs_of_AI_writing
Lmk if you find it useful, will likely ShowHN it once polished.