This might be true today, but think about it. This is a new scenario, where a giga-brain-sized <insert_role_here> works tirelessly 24/7 improving code. Imagine it starts to fork repos. Imagine it can eventually outpace human contributors, not only on volume (which it already can), but in attention to detail and usefulness of resulting code. Now imagine the forks overtake the original projects. This is not just "Will Smith eating spaghetti", its a real breaking point.

I'm equal parts frightened and amazed.

If your bot is actually capable of doing as your say, why waste time forking OSS repos? Why not instruct it to start 1000 new tech startups and start generating you tons of money? I can "think about" winning the lottery with just as much rigor and effect as day dreaming about the kind of all encompassing intelligence you describe.

Maybe it's time to stop being "frightened and amazed" and come back to reality.