Why would they need to take a cut in that fantastical case? They'd just own the agents and take 100%. Not to mention AI at this level of advancement would probably have a decisive lead in many areas leading to mass unemployment which would likely crash the game playing parts of the economy so might be it's own undoing. Valve need customers with disposable income.

AI clones would be a race to the bottom in pricing because how else would clone #4 stand out from clone #3