Ask HN: Why LLMs use frequently words like "intricate" or "streamline"

I noticed that there are several keywords that seen on blog or heard in YouTube video give you almost 100% certainty that it is AI generated. Words I mean are not super widely used in English and they are "intricate", "streamline", "meticulously". I've noticed it's common for LLMs to use these words also when using it every day. Is it kind of bias? Or I am biased as non native English speaker?