Regardless the possibilities of "why" they did this, you're missing the whole point. whatever is on MY device, is mine to use in whatever way I see fit. I might want to dissect the device and rip it apart, it's NOBODY's business.
The said channels were broadcasting live and VOD programs from public TVs of my original country.
Even if as you've put it, said channels are violating their terms of agreement, they should review it and take action BEFORE showcasing and putting it in their store for the public to use. I bought and advertised Roku BECAUSE of those selling points (the channels in questions).
It's like I buy a laptop that is advertised that it includes all these softwares. Then 6 months or a year AFTER i bought it, they'd sneak into the laptop and delete those softwares because it was violating their terms of agreement or their license to use those softwares in their laptops expired.
it's unacceptable and and I will raise my voice about it.