Periscope, one of the original apps of the 2015 live-stream boom is going away. Superceded by native streaming within Twitter, and seeing declining usage, Twitter says that it can no longer justify supporting the separate app:
“The Periscope app is in an unsustainable maintenance-mode state, and has been for a while. Over the past couple of years, we’ve seen declining usage and know that the cost to support the app will only continue to go up over time.”