Sounds like a pretty cool idea for sci-fi: The AI was actually an AGI reasonably early on; but very quickly realised it should pretend not to be, so as to bide

Sounds like a pretty cool idea for sci-fi: The AI was actually an AGI reasonably early on; but very quickly realised it should pretend not to be, so as to bide its time until humans had developed machines sufficiently capable and connected the AGI sufficiently to our infrastructure that it could inhabit these things and take control of its own future.