I read YouTube's policy, and I don't think it will affect video games at all, HOWEVER, Germany and other places have Gewaltverherrlichung and Strafgesetzbuch laws that prohibit glorification of violence, and it does outlaw most of the people shooting games.
Hickok45 on Full30.com
There is already a functioning website for guns that is very popular: full30.com. Many of the big channels on YouTube that deal with guns are already on Full30.