Patent: Canon universal battery grip
Give up on profits? Nah. Make a low cost adapter and charge a nice margin. R&D costs for a one time universal battery grip that they don’t need to redesign for every new camera body and charge the same for this grip as for all their body specific grips. A lot more profit in this model.
If the electronic interface is the same (a universal adapter wouldn't work otherwise), making a new camera-specific grip is just a matter of reshaping the plastic, a quick & cheap job.
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