Addressing your points in order: - Human hackers who run a botnet of infected computers are not able to run many instances of themselves on those computers, so

Addressing your points in order: - Human hackers who run a botnet of infected computers are not able to run many instances of themselves on those computers, so they're not able to parlay one exploit into many exploits. - You might notice I said it would take over hundreds of millions of computers, but only run millions of instances of itself. If 1% of internet-attached computers have a decent GPU, that seems feasible. - If it has found exploits in the software, it seems irrelevant what the interfaces "allow", unless there's some hardware interlock that can't be overridden—but they can drive on the highway, so surely they are able to accelerate at least to 65 mph; seems unlikely that there's a cap. If you mean that it's difficult to work with the software to intelligently make it drive in ways it's designed not to—well, that's why I specified that it would use the software the way it's designed to be used to get onto a main road, and then override it and blindly max out the acceleration; the first part requires minimal understanding of the system, and the second part requires finding a low-level API and using it in an extremely simple way. I suspect a good human programmer with access to the codebase could figure out how to do this within a week; and machines think faster than we do. There was an incident back in 2015 (!) where, according to the description, "Two hackers have developed a tool that can hijack a Jeep over the internet." In the video they were able to mess with the car's controls and turn off the engine, making the driver unable to accelerate anymore on the highway. They also mention they could mess with steering and disable the brakes. It doesn't specify whether they could have made the car accelerate. https://www.youtube.com/watch?v=MK0SrxBC1xs https://www.youtube.com/watch?v=MK0SrxBC1xs