Dollar General is actually a different business model. Originally meant to be a thrift chain in an era when a dollar could buy much more, their prices have grown well beyond the name. It can outcompete Walmart because of its smaller footprint and simpler supply logistics.

Plus brand loyalty is a thing. There are people who hate Walmart but love Dollar General, and the reverse. Dollar Tree/Family Dollar (itself more of a thrift store than its owner Dollar Tree) doesn’t offer the same appeal, to the same people. These aren’t actually direct competitors.

Still, in areas that can’t support a variety of business models, it’s depressing. It’s a guarantee there’s a shuttered downtown near these stores.