Apple TV app crippled on cable box

I have discovered a few limitations of the Apple TV+ app built into my cable box.

Once, I rented a movie on my computer then attempted to watch it on the device. I was unable to even find the movie. Searching for the title turned up nothing. I also used a Roku connected to the TV and that worked, so I was able to watch the movie, but only in 1080p because that was the resolution on the Roku. The TV and cable box support 2160p, so I lost out on quality that I was paying for. Apple provided a refund but was unable to explain the failure of the app.

Today I tried using the app to view the WWDC telecast. Normally the WWDC telecast is prominently featured in the opening screen. Not there. I searched for WWDC. Nothing. Not today’s telecast, nor any previous show. 

I chatted with Apple support about this but the person I was connected to was unable to explain the limitation.

Has anyone else encountered something similar? Is there any explanation for this? Seems very unapple-like to do something like this.

My provided is Shaw in Canada. The service is called Ignite.