Prosecutors (and juries) already are expected to adjudicate fraud across cases that IMO are much more ambiguous than this.

I think it's fair to debate whether it's a good thing that, as I heard it put once, "everything is wire fraud" (i.e. lots of crimes require lying on documents that are sent electronically and thus become federal crimes), but I see zero reason to think that committing academic fraud (which, again, is done for personal gain and causes real, measurable harm to others) is any less of a crime than lots of other things that are prosecuted as wire fraud.