The manufacturer could have added connectivity via mobile baseband and a SIM card, just for the privilege of harvesting your viewing habits and passwords.
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.