I agree, imo unless something drastic changes, there's little chance Tim Sweeney sells control of epic. But I believe Tencent bought nearly half of it all the way back in 2012 I think? I think they raised money from some PE groups a few years ago, the internet seems to agree that Tencent still has 40%? But, it being a private company, I wouldn't stake too much on the accuracy of that.

Point is I agree it's not for sale, for the reason you describe, but also that one of the leviathans already has nearly the entire minority interest.

I made this point in another comment thread, but I think MS would make a competitor to Unreal/Unity instead. Think of all the game engine talent they now have. The IW engine for CoD, Halo’s slipspace, WoW. They could readily assemble a team to build an engine on par with Unreal.

Everything is for sale for the right price. And what is good for Unity does not mean it's good for the consumers.