It's not readily apparent to most that each channel provider creates and maintains the specific version of their app that runs on the Roku system. The only channels that Roku maintains are their own The Roku Channel, the Roku Media Player, and several Roku information channels. For everything else, Roku just provides the platform on which they run.
If you want a channel added to Roku, contact the channel operators and let them know you'd like them to develop a Roku-compatible version of their app.
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