It depends on the policies and security measures set by the netcoins platform.
Generally, two-factor authentication (2FA) is an extra layer of security used to protect user accounts and prevent unauthorized access. If netcoins requires 2FA for all user accounts, then you will not be able to use your account without setting up 2FA.
However, if 2FA is optional, you may be able to use your netcoins account without setting it up. But keep in mind that not using 2FA can make your account more vulnerable to unauthorized access or hacking attempts. It's recommended that you use all available security measures provided by the platform to protect your account and assets.