Meanwhile... MapKit.js has “a free daily limit of 250,000 map views and 25,000 service calls”
https://developer.apple.com/maps/mapkitjs/
Edited to answer daveidol's question due to ridiculous HN rate-limiting: Apple doesn't license Apple Maps for anything other than their own mobile platforms as far as I can tell. It can't be used as a general-purpose Google Maps replacement.