Americans sure do love giant mega corporations. It doesn't have to be this way, guys.
Plenty of other grocers/retailers could go the Doordash route and be competitive.
Consumers will generally choose efficiency (manifested as lower prices) over security (local stores with local owners resulting in redundant supply chains).
Browbeating people into accepting a less-efficient alternative, regardless of how you think the morality stacks up, just won't work.