At my previous job GraphQL was considered because the frontend team was poorly served by the API exposed by the backend team. Everything was available, but the frontend needed to join, filter, sort and and adapt it in all kinds of ways for different UI. The backend team was too busy to provide the same data in different shapes, so the frontend had to do this manually. Of course they wrote their own code to do this all the time, but what they would rather have spent their time on was UX and business logic.