Implementation is free, but I would assume access to the real time data through API is something you have to buy a license or come to some other kind of agreement. It isn’t probably that much in the big picture, but hard to give even that if you don’t have much yourself.
App itself works just as well as it always did. It just doesn’t have access to the needed data at the moment, unless you change the Jolla’s API credentials to your own in the config-files or wait and see if the Jolla’s access is renewed one way or another. The newly added error message is there to let people know that the app itself isn’t broken, just the access to the weather data is blocked.