Yes. I see this as a big problem, but I'm not sure what the best response is. You can talk about Steemit, but the truth is that kids today live on YouTube, and they will not have a chance to be exposed to ideas that YouTube doesn't like.
The rule is vague about how YouTube will determine if someone "intends to sell" a firearm. If you did some gun reviews 5 years ago and linked to the manufacturer's web site, you can lose your entire channel!! This will have the result of killing the gun culture. An example channel that is likely to disappear is hickok45.