I am encouraging students to get $100 free credit through github but they still have to add a credit card. These people are students. many of them are under 16. They do not have credit cards so they cannot access the service.
Unfortunately, we need to require users to activate their account by adding a payment method before using their credits due the large number of fraudulent signups we receive. In addition to credit cards, we also accept PayPal.
If you need more help with billing questions, please get in touch with our support team: