Hello, weather app developer here (https://wg.tomaskafka.com https://wg.tomaskafka.com) As multiple people speculated on reasons, I believe it is very simple -

Hello, weather app developer here (https://wg.tomaskafka.com https://wg.tomaskafka.com) As multiple people speculated on reasons, I believe it is very simple - before the acquisition, Apple didn't have weather data, and thus was forced to direct their users to weather.com, which is a terrible, ad-infested (and probably personal data harvesting) experience. Don't forget, every weather provider gets hourly access to your real location, which is very valuable. Dark Sky acquisition fixes that.