It's not clear yet what prompted the end of Ustream on Sony devices, but it's essentially a blackout on all of them. In addition to ending livestreaming from the PS4, users will no longer be able to view Ustream videos from the "Live from PlayStation" portal on the console, the PS Vita and the mobile PS app.

Support for Ustream on PlayStation is ending. Click here for more info: https://t.co/rcEAAetcxt — PlayStation (@PlayStation) June 28, 2016

In the years since Sony launched the PS4, there's no doubt that Twitch has become the dominant platform for game streaming. It has only grown in that role since getting acquired by Amazon in 2014, creating a new eSports league and pushing game developers to bake streaming into their games from the outset. On the other hand, we haven't heard much about Ustream since it was bought by IBM back in January to power its enterprise broadcast services.