Offshoring restrictions tend to founder on practicalities. Exactly what constitutes offshoring? If a company creates a subsidiary in another country and hires people to produce a product, is that offshoring? What about when it buys a product from an independent company in another country?

If I fire a bunch of people in the US and hire the same number of people in another country to work on the same project, that's clearly offshoring. But what if I don't fire anyone in the US? What if I fire them five years later?

The whole thing is a mess for regulation and I suspect if you wrote regulations that weren't easy to bypass you'd hamstring local producers.