But having an intensive hiring processes doesn't guard you from hiring the wrong person. So they fail again and again, while making the hiring process even harder every time. Its a death spiral. You can easily spot a startup stuck in this death spiral if someone trusted with hiring other people tells you they get a lot of applications but none of them are any good.
I'm sorry that doesn't help you much in your situation, but I hope it explains why you see a lot of defunct hiring processes these days.