I love GraphQL and use it quite a bit, but the "graph" part of it is a bit of a misnomer given all the existing graph database and query technologies. It doesn't really offer anything in terms of interacting with RDF triples or making complex graph queries. It has no relational algebra semantics or ability to query relationships between arbitrary nodes, which is what folks using graph databases typically want.

(I didn't downvote you though, it's a common misconception.)