: According to official Google Play Gift Card Terms, credits are not redeemable for cash or other cards.
: You cannot use your balance to top up Google Pay for real-world transactions or store-wide hardware purchases at the Google Store. YouTube Premium use google play credit to buy gift card
The primary reason you cannot convert Google Play credit into other gift cards is rooted in Google's strict ecosystem policies designed to prevent fraud and money laundering. : According to official Google Play Gift Card
: Your balance is considered "prepaid credit" for digital content within the store (apps, games, movies, books). It is not treated as a liquid currency that can be transferred out or used to buy a different prepaid instrument. use google play credit to buy gift card