FaunaDB looks like a great product for a serverless/SPA type app but I don't see how they are integrated with netlify other than they fit together well?
FaunaDB support is built into Netlify Dev and was shown in the Netlify CEO’s keynote at the JAMstack conf. Netlify also has one-click deploy support for including FaunaDB with your applications. For instance this sample app can be deployed almost automatically: https://github.com/sw-yx/netlify-fauna-todo (Disclaimer, I work for Fauna and helped with the one-click deploy integration.)