If magicmuffins has the rating MA, R and NC-17 turned off, then I would have to agree with him that there should be expectation that the settings be honored by the front of the channel store.
Nothing in the parental controls knowledgebase article really help address the situation. The suggestive channel names and suggestive channel icons are displayed despite if the PIN feature is used or not. The show/hide home screen items also doesn't seem to apply to Just Added.
I think Roku needs to review their policies for this type of situation. In this situation, channels such as The Grindhouse Channel, Happy Hour After Dark and Retro Sexy Channel should be required to have a reasonable manifest attribute and Roku OS channel store should provide a lock icon with the title "Some Channels HIdden" which requires a PIN to view.
I would also like to point out that while the content inside a channel usually comes from servers not controlled by Roku in which there is a fair case Roku is a common carrier, I think what magicmuffins is talking about is not covered by that. The channel titles and channel store icons are something Roku should have been exposed to during their channel certification review process. The fact Roku has a Family/Kids channel section may indicate awareness by Roku of kids use of their devices as well as be treated as implying a fitness for such use. If I'm right that the channel review process may make Roku a publisher channel titles and icon instead of a common carrier, then there might be some liability to Roku leaving this situation unaddressed.
Even if existing laws in each country Roku is available for purchase doesn't cover the current situation. This seems like the type of situation that can become an government official's cause to turn into a future law (such as UK's effort to clean the internet).
Roku might do well to consider how Valve handles this in the Steam game store as explained here:https://www.howtogeek.com/365745/how-to ... -on-steam/
In Steam's case, the default setting would keep channels as being discussed now from accidentally being prominently featured in a just added section. Instead the user needs to explicitly set Steam to allow such content to show.
I would agree to some extent a parent needs to take responsibility to carefully monitor their children's interaction with these devices. But I don't think that should let Roku off the hook when the device is stated to include parental controls, provides channels targeting kids and then provides questionable content in such a prominently/easily accessed location before any such parental controls take place.