I know for a fact that this is one of the major pain points, why they can’t or want to publish on Steam. There are games or programs with GPL code on Steam, but they do not make use of those features, because it would mean mixing incompatible licensed code (Steamworkshop) with your games code (GPL). I don’t know if things have changed, but I know in the past that was an issue. Also dynamic linking is fine, not compile time linking. Those are two different things. I did not say dynamic linking is a problem.