[pjmlp]

It isn't, some people managed to get quite rich with games written in GC languages.

There is an agenda there, the business did not go down well with Unity for Xamarin, and now there is the whole Swift for Godot that needs to be sold for adoption.

Unreal uses a GC for C++ code, yet the performance problem most people hit on Unreal is compiling shaders.

Finally from academia point of view, reference counting is a GC algorithm, as any book worth reading in CS curriculum will have it as such.