If I pay $40/month for Youtube TV, and go into the Youtube TV app, and search for a show, I am searching for a show within the offerings of the app I am in. I do not want to be offered a show in a yet another app for which I will have to pay yet another monthly fee.
And I especially do not want to be driven towards another service for which I will have to pay another monthly fee, if the show I am searching for is already available in the app I am already paying for and from which I am searching.