Comment by oneplane

What stops them is one of two things:

Option 1: they operate a separate shard in that country and that shared is only accessible by that country. Companies like Apple, AWS, Cloudflare etc. have been doing it this way in China for a while now. Result: they can spy on the stuff in their country, but the only stuff in their country is their own stuff.

Option 2: no longer operate in an official capacity in that country. Have no people and no assets. Mostly works when the country is not a significant market. This usually means some things are only available grey market, black market or not at all. This is why certain products have lists of "supported countries" - it's not just ITAR stuff but also "we don't want to deal with their regime" stuff. Result: country gets nothing, no matter how loud they ask. Side-effect: you can't really risk your employees visiting such a country as they will be "leveraged".