No offense to any em-dash lovers, but I think an overuse of em-dashes indicates that your writing is probably slop, just not AI slop, human slop. In a sense, there is a kind of slop that relies on em-dashes to glue things together - usually in a cliche way, learned from lazy journalists copy-pasting from their last article to add a bit of spice to their writing - and AI just copied it.
(On the other hand, maybe it's just low-paid writers in South Africa: https://www.theguardian.com/technology/2024/apr/16/techscape... )