There are other ways with 2FA, like cryptsy by sending an email with a key, simple and easy as that!
Why to sent them my phone number?
We should sent them email to express our disagreement
Please do, what they've done to alter hundreds of thousands of people's account without owner's consent, while not criminal I'm sure by their TOS, I would consider criminal. Does a bank account just change your pin number without you initiating it? Or how about your email changing your password without your knowledge? GAW is doomed now in my opinion unless they make email 2fa, a disable option, or just scrap it altogether for withdrawals. Signing up is one thing, but locking people out of their own invested money is another.