Converting a $75 Amazon gift card to cash is not a legitimate or straightforward process. Amazon gift cards are designed to be used within the Amazon ecosystem for purchasing products and services.

Engaging in any attempt to convert them to cash often involves dealing with unregulated and potentially fraudulent channels. There are numerous websites and individuals who claim to offer such services, but these are likely to be scams. They may take your gift card details and disappear without providing the promised cash, or they could even use your information for malicious purposes.
Moreover, it is against Amazon's terms of use to convert gift cards to cash. Amazon has strict policies in place to ensure the proper use of its gift card system. Participating in illegal conversion activities can lead to various consequences, including potential legal issues and loss of your gift card value. It is always advisable to use Amazon gift cards for their intended purpose on the Amazon platform rather than attempting such risky and illegal conversions.