Problem with this paragraph is Ian have already covered guns and ammunition that were/are just for the civilian market and not military.
Sure, Ian has covered civilian guns before. Universally, they had something he found
interesting about it. It was either because they were related to some military project, sold on the civilian market by military contractors because they weren't picked up by any military/law enforcement organization, owned/designed by someone interesting, production/design prototypes, or just plain fucking weird/disastrous (the Zip 22, for example). Even videos like the one on the Mini-14 mention them being used by LEO/militaries and spend a lot of time on the background of the development process and the designer's intentions for the guns.
It needs to be interesting to him, either in design or history, and most civilian guns out there simply don't have much to talk about in terms of history or engineering. He talks about it himself: there's no point in doing videos on the vast majority of new pistols coming out because they're almost all polymer-framed wonder9s with very little to differentiate them from the rest of the pack besides price. Which is why he spent so long fellating the Hudson H9 and the Laugo Alien: they were trying something different and that nerd loves himself some novelty.
Even those cohorts have shown interest in guns despite the inability to legally own anything for self-defense like those already mentioned, Japan and elsewhere.
Yes, but are these fractions of those cohorts substantive enough to sustain viewership of a channel with over 2 million subscribers and seemingly mounting expenses? I would argue not.
If you want to know why he's going with sponsors, it's because the vast majority of the audience on youtube, particularly guntube, are already used to 1.5 ads per videos. I don't think he's appreciably lost views since starting to run those ads on his videos. So not doing it is leaving money on the table, and I'm just glad he hasn't picked up any spots from Raid Shadow Legends yet. This is the content landscape we live in, unfortunately.
Anyway...
Instead of branching off into mass produced and exclusively civilian guns (a subject he's probably not as passionate about) I'd rather Ian stole the "vignettes" format from Karl and started talking more about interesting events that tend to get drowned out by the larger narratives of war. Like the occasional videos he does with those history tours. The man can spin a good yarn, after all. Failing that, I think it would be interesting to see him trying to learn the history and details of artillery pieces and whatnot. Give the Chieftain a call, see if he can sneak him into a couple military vehicle museums/collections. I rather enjoyed his occasional videos on pack howitzers, mortars and the likes.