Ultimately, ouverture is just a tool to help users manage and listen to their music collection. While it can certainly be used to acquire DRM-protected content, so can many many other tools, such as youtube-dl, and there are legal precedent in favor of the existence of such tools.
While ouverture will do its best to not provide DRM-infringing defaults, it will neither implement mechanisms to prevent such usage, as per my (lead developper) personal opinion, although thinly supported, with regards to the actual revenues online services pay creators. Ouverture shall (at some point) provide convenient ways of directly supporting the creators.