OK, but please don't do what pg did a year or so ago and dismiss anyone who wrote "delve" as AI writing. I've been using "delve" in speech for 15+ years. It's just a question where and how one learns their English.
That's what makes it such a good giveaway. I'm happy to be told that I'm wrong, and that you do actually use the proper double long dash in your writing, but I'm guessing that you actually use the human slang for an emdash, which is visually different and easily sets your writing apart as not AI writing!
I do them without surrounding spaces, because that's... how you're supposed to use them, and it's also less typing.
They also used to be a really good Shibboleth to tell if someone was using a Mac—the key combo on there is easy, and also easy to remember, so Mac users were far more likely than the median to employ em-dashes. It wasn't a sure tell, but it was pretty reliable.