If developer was a Business, they might try asking for mediation: "If you are a developer based in the EU and you offer goods or services to consumers located i

If developer was a Business, they might try asking for mediation: "If you are a developer based in the EU and you offer goods or services to consumers located in the EU, you may also apply to resolve a dispute with Google Play through mediation." [https://support.google.com/legal/answer/9792937 https://support.google.com/legal/answer/9792937]. No such luck for open-source developers.