I have just seen on the AGF that Youtube has made changes to their policy on firearms videos https://airgunforums.co.uk/threads/youtube-and-gun-channels.104972/. This is the following from a Google Search:
If you're posting content. Don't post content on YouTube if the purpose is to do one or more of the following: Sell firearms or certain firearms accessories through direct sales (e.g. private sales by individuals) or links to sites that sell these items.
Interesting to see how this will play out.