What is Ego?
Ego is desire to get pleasure and satisfaction, Ego is desire to protect and boost your self esteem by behaving irrationally, selfishly, dishonestly, etc.
What happens when you cancel your Ego?
You do not get pleasures that you used to get, that come from arrogance, dominance, hurting others, 'destroying' others (even your enemies), self aggrandizement, showing off, getting praise, boasting, etc.
You do not protect your vulnerable self esteem by irrational and dishonest behavior.
What happens to you then?
You feel bad.
You open up your self esteem, your soul to attacks, to being hurt.
This is the noble path of life.