It’s not that it’s hard (although it definitely is), it’s literally just infeasible financially and time wise.
And yet somehow Godot exists.
Somehow, they managed to build a viable 2D and 3D open source engine without a massive AAA studio so clearly your assumptions are just wrong.
You just don't like being told you have to take responsibility for a problem someone else caused, and to that, I don't blame you. It's not right that we have to go through any of this. But honestly, it's time for us millennials to realize that putting in the elbow grease to build alternatives to what others have done to us isn't doing that, it's us building the infrastructure to allow us to move on from the powers that be, and if you want to break away from them, you have to. Your abusers will not liberate you for you.
It's time to nut up and do it now.