The channel owners create their own Roku channel apps, provide them to Roku, and maintain them. The only channels controlled by Roku are their own The Roku Channel, the Roku Media Player, and several Roku-specific information channels. For everything else Roku just provides the platform on which they run.
Contact tvmuncho and tell them you want to be able to stream their channel on Roku.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X