Converting a $300 Google Play Store gift card to cash is an illegal and unethical practice. Google Play Store gift cards are designed for specific use within the platform to purchase apps, games, digital content, and other services.

Engaging in such conversions violates the terms and conditions set by Google. These gift cards are not intended to be exchanged for cash. It undermines the legitimate business model and ecosystem of the platform.
Moreover, attempting to convert gift cards to cash often involves dealing with unregulated and potentially fraudulent channels. This can lead to various risks, including loss of money, personal information leakage, and legal consequences. It is always advisable to use gift cards for their intended purpose and abide by the rules and regulations associated with them.