Converting a Play Store gift card to cash is an illegal and unethical practice in most cases. The gift cards are intended for use within the Google Play ecosystem to purchase apps, games, movies, and other digital content.

Engaging in such conversions violates the terms and conditions set by Google. It undermines the legitimate business model and can lead to security risks and fraud. There are no legitimate and proper channels to carry out this conversion.
Moreover, attempting to convert the gift card to cash often exposes individuals to scams and fraudsters. These scammers may promise to convert the card but then disappear with the money or provide false services. It's important to abide by the rules and use the gift card for its intended purpose rather than seeking illegal ways to turn it into cash.