Thats because the team that wrote Groove Music (and Movies & TV) originated from the Zune desktop player and Windows Media Center. In fact it still used a lot of core code from the Zune days for things like library management and DRM.
The Zune desktop app has to be the best music player I've ever used, it was awesome. I continued to use it long after I moved on from my Zune HD. Sad to see something so awesome abandoned.
Doubt it. Even if the app wasn’t published previously, it likely descended from existing code that already carried the name.
I work on a codebase that still carries product names that stopped being meaningful almost a decade ago. No value in renaming across the codebase and it’d be expensive because of how much code has to be touched.
Source: former dev on the team.