If my manager's manager's manager decides, for any number of reasons, to buy a product which is using US-based technology, then I don't reasonably have the option to "vote with my feet", but I do have a fallback called Regulation, which works its way all the way up the chain automatically.
Why would you ever expect that you would have a choice of what products you use at work? You are being paid to work there. And yes, if you feel that strongly, you absolutely do have the option to vote with your feet at any time.