You should try it before claiming ”not relational”, as it can totally store and use relational data, and also be very useful.
Even though it says ”graph” you don’t need to write graph traversal queries - just describe in GraphQL the nested data model you want to get out of the database and that’s what you will get.
If that is true, you could definitely not make it less obvious. This is not the impression I got from your repo ("variously licensed under the Apache Public License 2.0 (APL) and the Dgraph Community License"). Neither your docs nor your website mensions a "community edition" either.
Also doesn't look open-source at first glance.