I couldn't understand the article's logic. The restaurant owner didn't lose anything, actually Google help bring more ordering to them, except the owner don't need to worry about delivery.
If the restaurant gets a lead via a delivery-app, they they pay a fee to the delivery app. Here they would have gotten an organic "free" lead, that was then converted into a paid lead because Google inserted a delivery-app between the user and the restaurant. And Google probably earns some coin along with the delivery app.
Seems like Google wants to put a toll booth to monetize the action behind every search result. If I search for a toy and then buy a toy from a website, then Google wants money because they provided a "lead".