Of course! It’s not like animals have jet engines!
Human brains are merely the proof that such energy efficiencies are possible for intelligence. It’s likely we can match or go far beyond that, probably not by emulating biology directly. (Though we certainly may use it as inspiration while we figure out the underlying principles.)
I’m actually okay with semi-centralized. Most people need that to trust a platform, but it still gives you the option to self host if you really care.