There isn't, until there is. These things take time. The tech has to be adopted, the people have to integrate into game jams, indies percolate. Godot is young, my predictions are 3-5 years.
Regarding competition though, the question is about the unique selling points of Godot that would be hard to replicate. Before AI coding, there is a _lot of momentum_ for leaders in the game engine world. Everyone specializes and it takes many years of game cycles to make the switch to a new engine. Not anymore!
So we have yet to see a dog-eat-dog game engine world, and in that world, ejecting AI-coding could in fact be a net negative. That's what I am arguing at least.
Regarding the unique selling points of the engine: 1. Open-source 2. Node/Scene encapsulation design: Big! - Easily my favorite part of GDScript. Easy to replicate. 3. Scripting languages: GDScript, buggy C# - AI-coding doesn't care what language as long as it's popular
My suspicion: A competitor could use a known compiled language (Rust) and a scripting language (luau) and get the same mileage as Godot and replace every one of their selling points with more performant code. Because they waited so long to deploy a marketplace, they have very little sticky bits to their market share.