Unreal Engine royalties only start after you make $1 million from a project. Even then, it’s 5%, and waived for sales done on the Epic Store (whose 13% cut is almost a third of what Steam takes). If you are a small indie dev, you won’t be paying Epic a dime unless you start rolling in some serious dough, and even when you do, 5% of your revenue for using one of the most powerful 3D game engines is pretty fair
Western doctrine is also largely based on the US’ needs. Artillery just isn’t practical for the US, who needs to be prepared to fight all over the world oceans away from home. Artillery is much more stationary compared to air power due to the size of the guns and the difficulty moving them, while the US can easily fly planes anywhere we need them. As such, Western doctrine became heavily reliant on having air supremacy and massive amounts of air support and our equipment was designed for that battlefield. Ukraine just doesn’t have nearly the same arial capabilities as NATO, relying much more on artillery which NATO weapons and doctrine weren’t designed around, and they’re having to figure out how to make them work without air power