Given that those offers were in California, they probably didn't. Excepting certain rare circumstances, non-competes are unenforceable here.

And thank goodness. One of the reasons the tech industry in California is booming is the large talent pool available to employers.

A company can sue you in, e.g., WA state court, and get a judgment based on WA law, that is enforceable in CA.

If you are subject to a noncompete & moving to a state where they aren't enforced, the smart thing to do is to get a summary judgment in that state. Otherwise jurisdiction is a matter of who shoots first.

Sure. Sorry if it wasn't clear, but we were talking about offers from Silicon Valley companies for jobs in California. Even if they put a non-compete into the contract, it is unenforceable.