There is something unique and different about God's name. In the Bible names meant various things. So, all that God is, does, and says, is included in His name. When man doesn't show proper respect for God and His name, he is breaking this commandment. The Wrong Use of God's Name.
Profanity is of no value and of no reward.
Cursing a motor, won't cause it to start. Our speech indicates our character. If he will break one commandment, he will likely break another. Cursing causes a person to offer a profane and wicked prayer. Such a one, asks God to condemn someone in order to satisfy their desire for revenge.