Google Maps is also shoving Grubhub down our throats. Every time I try to call a restaurant's phone numer in the new Maps app, I end up accidentally opening a Grubhub tab in Chrome.
I... can't confirm this at all. Opened maps, clicked on a restaurant, selected "call", and brought up the phone app. The only way I can get to a delivery provider is to click a button marked "Delivery". And even there it seems to be suggesting DoorDash to me, even for restaurants that I can find listed on GrubHub's site.