https://www.gnu.org/licenses/gpl-faq.html#GPLStaticVsDynamic

Now, I suspect that what you had in mind was the kind of restrictions like “you can’t use this if you work for the military”, but that’s exactly the point he was trying to make: there are a lot of opinions and interpretations swirling around, and his intention was to talk about something else rather than diving into the license debate which has been running since the Reagan era.