This will allow payment through google play credit.
Some international credit cards might not be accepted which will allow for wider adoption. Additionally, google play gift cards are used for gifts for those who may not have a credit card or be too young to get one yet (but still want to be able to use premium features of bitwarden).
Lastpass does have this as a payment option so it would be nice to have this added as an option.
Related topics + references
Payment methods
Lastpass allows users to use google play credit to pay for premium