Indeed. This is why I have a hard time thinking of ems as "friendly", even as I concede they would be fully human - we have considerable historical precedent as to what happens when one group of humans is much more powerful than a colocated other group of humans.

Frankly, humans aren't human-friendly intelligences. As such, it's not clear to me that "human-friendly intelligence" is even a sufficiently coherent concept to make predictions from; much as "God" isn't a coherent concept.