I interviewed at Two Sigma in 2018 and got the impression they were already getting very deeply into using AI. I'm sure they are using LLMs to analyze news articles, etc. I bet a high schooler has probably hooked up an LLM to a trading bot.
If you can imagine ANYTHING can be used to gain a market edge, there are probably scores of very smart people who are trying it/have tried it/have figured out it wouldn't work.
The only exceptions are if it's something so small a big firm wouldn't care much about it, or you have special knowledge of a technology that most people barely know about.