None of this is attributable to engines, it's the size of the products built using the engines and it appears that the ad revenues are not included and that appears to be another $80B.
The game engine market is the market of supplying the game developers with the tech to build their games. That's where the game engine makers that spend 1B per year and hold %30 of the engine market need to charge about %2 of the products made using their engines to break even.
