The fork on that model is listed as steel i believe, so comments re aluminum are not applicable.
Also since it broke at the crown, the motor torque would be minor compared to the max potential braking torque at that point.
Unless there were some other factors ( accident / abuse), then the OP was correct in thinking this was most likely a manufacturing defect.
Some photos of the breakage point would be interesting.
This failure and resulting injury causes pause for thought.
Yes. but that thought would be what exactly. ??
...inspect all welds before riding ??
...only ride bikes with reputable components ??
...dont ride bicycles ! ??