Technically WebRTC and SyntaxNet have nothing in common. What they do have in common is that Google again makes it easy to add capabilities, once in the hands of the rich and experts, as a feature into applications. Once this is possible, Natural Language Understanding (NLU) can be added also into WebRTC applications. How can WebRTC applications benefit from it?
Google is again taking a technology that was until now in the hands of the rich and experts making it a feature in any application. SyntaxNet will do the same to the complex technology of NLU. With SyntaxNet becoming a free to use open source, Google is doing to NLU what it did in 2011 to communications. Both WebRTC and NLU are technologies. They can be combined together