For business conference calling they have meet, which is pretty similar to Hangouts for that purpose and is what we use at my office for conference calls.

I've never tried to make a call to a single person with Hangouts because Snap, FaceTime, and others are better. They also had another app that competes with Snap and FaceTime; I don't recall the name.

So, seems like their shutting down something that's already been replaced by their own tech.