AGI used to be synonymous with ASI; it's still unclear to me it's even possible to build a sufficiently general AI - that is, as general as humans - without it being an ASI just by virtue of being in silico, thus not being constrained in scale or efficiency like our brains are.

Well, it could pretend to be playing 4d chess and meanwhile destroy the economy and from there take over the world.

If it was first, it could have self-improved more, to the point that it has the capacity to prevent competition, while the competition does not have the capacity to defend itself against superior AGI. This all is so hypothetical and frankly far from what we're seeing in the market now. Funny how we're all discussing dystopian scifi scenarios now.