So you want to blame the exchange for not forcing you to use the extra security they provide and your answer to that is to force everyone else to have to use it. Fucking ridiculous, your out of your fucking mind. Go back to banks and fuck off.
Well maybe they should leave the option open for idiots like you to switch off the 2fa with the following disclaimer: At your own risk! It is a matter of time that your account will be hacked and your coins stolen.
Not everybody knows that nowadays you don't have to provide your mobile number or other private information to enable 2fa. That is why a lot of people have not enabled it. It is the task of a decent and reliable exchange to educate and inform their customers!