This mentions Apple mapkit js. This is the first I’ve seen of that. Has anyone used it before? I’m wary of building anything on a proprietary JavaScript api, but if they provide tiles that can be used in leaflet or mapbox gl it might be an attractive option.
Beyond that use this form to request an increase in your limit: https://developer.apple.com/contact/request/mapkitjs/
As for pricing, nothing has been announced at this time.