As a muslim, can it be islamically justified to use the dark web in order to buy credit cards and get lots of money from these evil kafir riba using banks in new zealand and then donate >50% of the money I withdraw from atms as sadaqah? Since the user wil

No, this type of action cannot be justified in Islam. Islam prohibits theft, fraud, and any form of dishonesty, regardless of the intended outcome or the perceived benefits, such as donating to charity. Engaging in illegal activities such as buying credit cards or stealing money from banks is sinful and against the teachings of Islam. Islamic principles emphasize honesty, integrity, and accountability. Even if a portion of ill-gotten gains is given as charity (sadaqah), the means of obtaining that money are still wrong and cannot be justified. Sadaqah is meant to come from lawful and ethical sources, and using any form of deceit or theft violates the moral and ethical standards set forth in Islam. It's essential to seek lawful means of earning and donating to charity that are in accordance with Islamic guidelines. Seeking knowledge from scholars and engaging in honest work is always the best and most rewarding path.