Why ProtonMail?

We all give importance to our privacy,but how many of us are aware that all our personal data can be used by different internet giants like Facebook,gmail etc.
All our personal data are sold to advertising companies for billion dollars.
Email communication is used by everyone,since all your personal data are stored in third party server along with secret keys, you have more chance for your personal data leakage.
After watching  this TED talk, I immediately signed a new account to have encrypted email communication using ProtonMail.
All the features of ProtonMail are excellent.
Now i am waiting for their invite.