alt Hacker NewsI like the GPL. I just don't know how much you can actually enforce it.
Also, "don't use my code" is not viral. If you break the MSFT license, you pay them, which is a very well-tested path in courts. The idea of forced public disclosure does not seem to be.
How much do you pay them?
If the GPL license didn't exist, and instead you just relying on copyright, then that's an injunction. You have to stop using the code you "stole" and pay reparations.
In UK law, if you distribute copyright material in the course of a business you can be facing 10 years in prison and an unlimited fine.
Sure you can't get them to agree to the GPL, they could simply stop distributing and then turn up to their stint in prison and massive fine. In reality I suspect they would take the easy way out and comply with the license.