I was given a six month ban from /k/ for "Advertising own channel." Board rules do not forbid linking to youtube channels, nor do any of the stickies. Not only that, but the linked channel explicitly discusses firearms, which is a significant portion of /k/'s subject material.
A 6 month ban for posting something both on-topic and permitted by board rules? The mod responsible can eat a bag of dicks for being such a huge faggot.
See my following posts for the screencaps of the rules page and the sticky that links to it.