depending fully on crypto currency as a means of livelihood is a wrong decision, like the author likely said, its good to earn bitcoin and crypto currency through the various means possible, but depending solely on it as a means of living will result in emotional disorder in times of a bearish market like we are currently in now.
Everyone in this world must have strategy in their life. Life who only depends on crypto i think is totally wrong, and like you and other else in here might be agree with it. We must have real job with fixed salary to keep maintain our life.