I’ve been a fan of Pluto TV for a while. The cartoon channels (particularly After School Cartoons) first got me semi-addicted. Pluto also got me turned onto watching news mostly on streaming and international networks. Since I can get more straight news from CBSN, Sky News, etc. (plus others that stream outside of Pluto), I really don’t care much to watch the dead horse beating on CNN/Fox News/MSNBC anymore.
Anyway, I saw Pluto added BUZZR on their iOS app over the weekend. I’m out of town and can’t check Roku at the moment. But if you have a Roku and an iOS device, you can use the iOS Pluto app in “Remote mode” to cast the desired Pluto channel to your Roku. (I think the Pluto Android app has the same feature.) You might be able to run BUZZR on Roku that way?