I think I can see it: Brackeys was THE main Unity instructor. So people looking for Unity content will now drive their attention to Godot thanks to Brackeys.
GDQuest is tailored mostly to those ALREADY in Godot, and occasionally the ones looking to start gamedev.
But the reach of Brackeys is much higher to grab the ones starting out due to channel size and Unity is mainstream so people who search "how to make games with Unity" will watch Godot's content now via Brackeys.