The only time I used the em dash was when Microsoft word used to automatically add it to something I was typing. Usually it was formally typed stuff like essays and reports. I have never in my life used an em dash for anything else. Usually just a hyphen "-" at most.
Came here to say the same thing. Folks have been saying for a while "it's a tell tale sign of AI!" and I've been thinking - have people forgotten about Microsoft Word (and other word processors) automatically changing a hyphen to an em-dash?