"DoorDash and Instacart believe that communities benefit when Main Street competes"

That's rich! Communities benefit when small businesses compete against each other. Announced as part of a merger of two giant public companies.

But doordash says this merger means more choice for the consumer, how could antitrust play a role here? I mean, unless they're lying about removing choices from the market place will result in more choices in the market place, but doordash wouldn't do that would they?

I mean neither of these companies provide an important service. If they both disappeared tomorrow I think most people wouldn't care.