memex-explorer + blockchain is the model. A company can not do it. A company can design a platform, and many companies can sell on the optimization & information marketplace to fix problem.
[EDIT] And as an addendum to this fun tangent, even if the AI was capable, in principle, of reading billions of webpages fast and well, we don't know the power requirements would be for this. This hypothetical small company may have stumbled upon the right algorithms and the right training data to produce a true AGI, but they may simply not have the hardware or the engineering know-how to scale it up across multiple processors. Or scaling it up may require too much (i.e., more than the company can afford) data bandwidth if the robot is controlled. Again, it depends on the details of how they arrived at the AGI.
Entrenched businesses are RARELY displaced from their top position. Instead, what usually happens is the world changes around them, and the entrenched business is ill suited to compete in the new world. Nobody ever managed to seriously challenge Microsoft for desktop/laptop OS dominance: https://en.wikipedia.org/wiki/Usage_share_of_operating_syste.... The issue is that desktop/laptop OS dominance is no longer as important as it once was.