While iOS users of the weather app will not be affected in anyway, Android users will no longer be able to buy the app or use it after 1 July 2020 as their statement reads:
There will be no changes to Dark Sky for iOS at this time. It will continue to be available for purchase in the App Store.
The app will no longer be available for download. Service to existing users and subscribers will continue until July 1, 2020, at which point the app will be shut down. Subscribers who are still active at that time will receive a refund.
That isn’t all as their statement continues saying that all of the embeds or weather maps used by other websites will also not be functional after 1 July 2020 and their API service will not be accepting new signups although it will continue to function until the end of 2021.
Apple basically bought the weather app Dark Sky and made it exclusively available on only its platforms which has received a lot of criticism by people on the internet.