I see that the project appears to depend on Mongo and Redis, both non-open source. However, both have substantially compatible alternatives that a user should use in their place. Even if they did not, having the source code available under an open source license means that users can fork it and swap these databases out for something better. Users can learn from and modify the source code for their own uses. Users can review the source code for quality and security. All of these things are possible when the code is open source. So yeah, it would be nice if it used open source dependencies or at least officially supported alternative open source dependencies, making the application open source as is is still a win over keeping it proprietary.
