Earlier quoted context omitted.
So for a few million views (==3m?), that translates to $600-$12,000? huh, I would not have guessed that. But I also have no concept of how much a few million views is for a typical content creator.
A typical full time content creator creates a new video per day. To go full time you'd need a couple of thousand per month, lets say $2,000. With these numbers that is 500k to 8 million views a month, or around 15k to 350k views a video. That might not sound like a lot, but given that it is for the entire world you can fit basically any niche within those numbers. Go full time crushing things with an hydraulic press?…
A common fallacy in business.
> Go full time crushing things with an hydraulic press? Yes! Go full time discussing medieval weapons? Yes! Go full time building things with no tools from scratch in the woods? Yes! Go full time trying to beat Super Mario as fast as possible? Double yes! And so on.
They're not that much a weird niche really. Go to any large university and there's probably a club full of people who discuss medieval weapons full time. Actually there's probably at least two (one that's more purist in terms of historical accuracy, and another that's more focused on fun), then there's probably also a fencing club, a kendo club, maybe a HEMA club, dozens of gaming groups.
And it's not like it's not niche that isn't served by TV. There's plenty of documentary / infotainment series on medieval weapons and combat. There's serious series. There's Deadliest Warrior. Youtube often gets viewers because it's a different format, not because it's serving a very weird niche. Cheap, regular content (and often the comment box keeps creators a bit more honest), suggested next episode, more talky, short episodes.
As for those other examples, there's Mythbusters (smash stuff!), survival shows (primitive technology in a different format). Gaming is the only really odd one - it just isn't shown on TV much.