You're extremely correct, of course, but what I'm really proposing here is something much more boring than actually solving the technical problem(s). How about a dose of good old-fashioned bureaucracy? If you want to sell exploits, in a Western country, then yeah sure you can, but first you should have to go through an approval process and fill in a form for every customer and have them vetted, yada yada.
This wouldn't do anything to stop companies who base themselves in places like Russia. It wouldn't even really do anything to stop those who base themselves in the Seychelles. But, you want to base yourself in a real bona-fide country, like the USA or France or Israel or Singapore? Then you should have to play by some rules.