Neo4j is by far used more than any other graph database out there. Regardless, the standard is not Neo4j specific. It was a collaboration from many companies in the space. They all agree it's a good move.

Well I've no statistics about tinkerpop vs neo4j and other usage, I may be wrong. But I know for sure that far more graph databases supports gremlin than supports opencypher. E.g the latest graph database from Microsoft https://docs.microsoft.com/fr-fr/azure/cosmos-db/graph-intro... Also, Cypher has performance and expressivity issues.

Just looking at https://db-engines.com/en/ranking/graph+dbms clearly shows Neo4j as the most prominent graph db.

I think even Cosmos as number 2 might be misleading here, as Cosmos is a multi-model product and db engines doesn't distinguish between graph and non-graph use in the ranking. (Same for ArangoDB)

> E.g the latest graph database from Microsoft

As a contrast, the recently introduced RedisGraph only supports Cypher.