> This is both what many users would expect (if I have an app open, voice search works within that app), and a pretty reasonable ask for any business (don't show competitor's offering when searching within my app).

Only if I search using the in-app search feature do I expect it to be restricted to only that app.

If I'm watching a YouTube video and ask my device to play music, I expect Spotify to open as that's what I use and pay for.

The platform should prioritize the user, not the app developers.