deepstreamHub's records can be used instead of Firebase's realtime db/data-sync part, deepstream's events are a replacement for their lately added PubSub capabilities. deepstreamHub does request response as well while Firebase offers integration with numerous Google services.
The core differences are in the way deepstreamHub structures its data (small, related documents with independent lifecycles rather than one big data tree), its speed and open core
that's true - Firebase is pretty much a Gateway to google's cloud and add-platform. deepstreamHub is an alternative to Firebase core (or what Firebase used to be pre Google acquisition)
The core differences are in the way deepstreamHub structures its data (small, related documents with independent lifecycles rather than one big data tree), its speed and open core