Northern Trail Outfitters (NTO) uses Salesforce Experience Cloud sites (previously known as Customer Community) to...

 To automatically create a case record for first time users logging into Salesforce Experience Cloud using their Google account, the identity architect should implement a login flow witha record create component for Case. A login flow is a custom post-authentication process that can be used to add additional screens or logic after a user logs in to Salesforce. A record create component is a type of flow element that can be used to createa new record in Salesforce. By implementing a login flow with a record create component for Case, the identity architect can check if the user is logging in for the first time using their Google account and create a case record accordingly. References: Login Flows, Record Create Element