I'm an employee. It's not my product. I didn't include a link because I thought it would be too spammy. It's tallygo.com.
At this time, we are a mix of mapbox + our own data.
I don't know why you need to sign up to see sample code. I'll give that feedback.
For mapping you'd use it over mapbox because it comes for free with your navigation package. For navigation you'd use it over mapbox because it has better turn-by-turn instructions, routes and traffic estimates.
The map is accurate throughout the world. The navigation product is specific to North America at this time, but it will expand.