Except many of the obvious use cases (including stuff like smart homes and military drones) are already being built.

You’d need very strong international laws to prevent this manifesting from happening.

also, manufacturing robots and self-driving cars.

More likely, you'd need the threat of imminent destruction, which, honestly, wouldn't be enough to prevent anything. We've seen how effective a death sentence is at prevention, which is to say: not very.

How can you stop that? An intelligent AI will send emails, create companies, hire people, and literally anything else you can do digitally in order to create means by which it can manifest itself into meatspace.