It doesn't. Evolve is targeted towards apps not on Google Play and Beta tests. It's useful for enterprise apps (fix security holes without bugging all your employees) and beta tests (push updates to beta testers instead of waiting for them to download it).
We communicate with Snapchat's servers and pretend to be their mobile app. This gives us access to everything that you can do through the mobile app. For example, we can send messages, view (and save) messages, create new accounts...