And this runs head long into competitive issues. Google says they'll integrate the Google Assistant with OpenTable to let you book tables, but what's the chance OpenTable would nix that integration if Google was trying to make a free competitor? Google doesn't want to be in the restaurant booking system business, and this let's them offer a service in their assistant that no one else can.
Companies already go out of their way to place nice with Google (AMP pages). OpenTable really wouldn't have a choice. By being the default, Google has a competitive advantage.
Google doesn't want to be in the restaurant booking system business
Google wants to be in every business where they can gather data to better target advertising.
