MBXMapKit is deprecated in favor of the Mapbox iOS SDK 2.0.0 and above. The future of Mapbox maps is vector rendering, and Apple shows no signs of allowing custom vector rendering in MapKit, so we recommend that you use the OpenGL-based Mapbox iOS SDK 2.0.0 instead.
NOTE: Unlimited, per-user Mapbox pricing plans cannot be used with this version of the Mapbox iOS SDK.
See this doc for the original project details.