Converting a 100 Google Play gift card to cash is not a straightforward or legitimate process in most cases. Google Play gift cards are designed for use within the Google Play ecosystem to purchase apps, games, movies, music, and other digital content.

There are various websites and individuals that claim to offer services for converting gift cards to cash. However, these services are often associated with risks. Many of these platforms may be scams. They might take your gift card details and never actually provide the promised cash, or they could use your information for malicious purposes.

It's important to note that engaging in such unauthorized conversions violates the terms and conditions of Google Play. Instead of attempting to convert gift cards to cash illegally, consider alternative options. You can share the gift card with friends or family who can use it for their own purchases within the Google Play store. Another option is to use the gift card to buy digital items that you can then sell in a legitimate marketplace if you truly need to obtain value equivalent to cash. In conclusion, it's best to avoid the risky practice of trying to convert Google Play gift cards to cash through unregulated channels.