Molds? For custom boots, yes. For stock boots, no. Klingbeil uses a foam mold that you send in to have them double-check the measurements and angles. Klingbeil develops the last based on your measurements, not a cast of the mold.
I believe other custom bootmakers use the molds as well; I saw some of the boxes at other boot makers' booths at a trade show last year. Not sure how they use the molds, though.
Some online shops ask for photos of your feet if you want them to recommend a brand/model, along with a short survey of size, weight, skating level, discipline, etc.
This would be a great question to send to the skate manufacturing companies, just to get a tally of who does what.