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Yeah they do them themselves.
For domestic light use, overkill.
For couriers, just add a rear wheel motor (a good one) and you have the most dependable bike right there.
For home heavy use, yeah pinions ime are less prone to sudden implosion like igh are, but still aren't as efficient as a regular cassette /derailleur setup, and cost a lot more. Trick though!The shell they use isn't a steps or bosch shell, its only for pinion afaik.
What’s the crack with bullittbike.de and the pinion ebullitts? Are they modified bullitts with a different motor/crankset housing?