There's not a word in this article about why this breach of privacy matters while others do not. It's not stated whether this was in the terms of service for the app, and whether those terms were ruled against.
All kinds of apps have been selling personal information for a long time, and it's been ruled before that it's allowed if they have the proper legalese in the terms of service. Did this app just not have any terms of service?
Why is it a breach of privacy for this app, but other apps doing the same selling of personal data is not?