Unless YouTube has a killer app, I cannot see the reasoning behind even testing games, much less launching them to the public. Netflix has a selection of great mobile games that anyone with a subscription can download for free, and yet hardly anyone does.
If Netflix is having a hard time with their mobile game adoption, I think the writing is on the wall for this one. YouTube is going to have a difficult time competing with basically the entire web and App Store’s gigantic selection of free games.
I wonder if YouTube will make certain titles available to Premium subscribers only. Perhaps the maximum saturation of premium subscribers has been met, and product is thinking up new features for YouTube Premium.