The teaching exception does not include copying, only performance and display, copying and distribution is what's happening here. The plans I've looked at contained fonts/images that have specific licenses forbidding commercial redistribution/resale and they are distributed as part of purchased plans. The author of the plan includes links to where the fonts/images can be purchased but still distributed them in a commercial form. The DMCA safe harbor would be the only thing I think that would protect them, but that hasn't stopped suits in the past.