There is, unreal besides being a product has its source available and Godot focus on the same niche most of unity games were. But the problem never was the lack of replacement, the problem is, a game with years of development on unity whould not easily switch to any alternative, they have assets from unity store, scripts made for unity, UIs using unity specific stuffs, even network protocols could be bounded with unity. Change this is an herculean task and most of the games are in barely maintenance mode, imagine a full rework. So these games should be pulled of the market and thrown in the garbage to avoid new installations.