It's not readily apparent to most that each channel provider, like WorldSBK, adapts their app to run on the Roku operating system, provides it to Roku, and maintains it. 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.
For additional services you'd like to have available via Roku, contact the service and let them know.
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