A lot of this feels like staff experience vs AI. Will call the right people into the topic.
I do think it sound compelling to try to bulk up some of the “fast typing” detection we already have. Having SFS integrated into core may also be compelling.
There is of course the deep philosophical question:
Is it spam if it adds value to the forum (even if it is AI generated)
Should it be removed from the forum if it adds no value to the forum (even it if is human generated)
Neither of these have super clear answers.