Much of the world has agreed to sound like machines.
Another thing I've noticed is that weird stuff that is perhaps off in some way, also gets accused of being LLMs because it doesn't feel right.
If you sound unique and weird you get accused of being a bad LLM that can't falsify humanity well enough, and if you sounds boring and bland and boosterist, you get accused of being a good LLM.
You can't write like no one else, but you also can't write like everybody else.