> If you're using a fullscreen app on macOS and activate spotlight, do you expect it to only search that app, or do you expect it to behave like Spotlight always behaves and search the entire system?

To make another analogy: Maybe Roku should ask Google to make the Chrome address/search bar only show Roku.com results if you’re already on their site.

Joking aside, it might actually be a nice feature if you could use the search bar of your browser to search into the single site specifically, just like you can have different search engines already.

You can do that

On Roku if you search in an App it is localized. If you search on the home screen it is not. I expect voice search to behave similarly.

On Roku, voice search (using the voice search button on the remote) is always global. Google wants an exception for youtube. No one else gets this exception.

Regardless of what you think is a better user experience, Roku has made a design decision and are sticking to it and aren't giving Google special treatment, so Google is threatening to take their ball and leave if they don't get what they want.