Re: Does Roku Ultra or App control the data usage?
Your data usage will be determined by what is FED to the Roku, so your Your YouTube settings should prevail.
To minimize data usage be sure you return your Roku its Home screen when you've stopped viewing. Otherwise your Roku can continue to stream in the background even though you've shut down your TV.
Also you can turn on the "Bandwidth saver" to shut down the Roku when it's received no user input in 4 hours (Settings > Network > Bandwidth saver)..
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. If this post solves your problem please help others find this answer by clicking " Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X